Home / 15,689.12-21,650.34-8,518.76

Finding the Fourth Proportional to 15,689.12, 21,650.34 and 8,518.76

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Solution

The fourth proportional to 15,689.12, 21,650.34 and 8,518.76 is: 11,755.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.12 : 21,650.34 = 8,518.76 : x
  2. Step 2: Convert to fraction form
    15,689.12/21,650.34 = 8,518.76/x
  3. Step 3: Cross multiply
    15,689.12x = 21,650.34 × 8,518.76
  4. Step 4: Simplify right side
    15,689.12x = 184,434,055.26
  5. Step 5: Solve for x
    x = 184,434,055.26/15,689.12
  6. Step 6: Final answer
    x = 11,755.54

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Half scale
Find fourth proportional to 31,378.25, 43,300.69 and 17,037.52
Double scale
Find fourth proportional to 15,690.12, 21,651.72 and 8,519.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.