Home / 15,405.15-21,259.34-8,690.91

Finding the Fourth Proportional to 15,405.15, 21,259.34 and 8,690.91

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Solution

The fourth proportional to 15,405.15, 21,259.34 and 8,690.91 is: 11,993.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.15 : 21,259.34 = 8,690.91 : x
  2. Step 2: Convert to fraction form
    15,405.15/21,259.34 = 8,690.91/x
  3. Step 3: Cross multiply
    15,405.15x = 21,259.34 × 8,690.91
  4. Step 4: Simplify right side
    15,405.15x = 184,763,010.60
  5. Step 5: Solve for x
    x = 184,763,010.60/15,405.15
  6. Step 6: Final answer
    x = 11,993.59

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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.