Home / 15,686.56-21,650.52-9,720.88

Finding the Fourth Proportional to 15,686.56, 21,650.52 and 9,720.88

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Solution

The fourth proportional to 15,686.56, 21,650.52 and 9,720.88 is: 13,416.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,686.56 : 21,650.52 = 9,720.88 : x
  2. Step 2: Convert to fraction form
    15,686.56/21,650.52 = 9,720.88/x
  3. Step 3: Cross multiply
    15,686.56x = 21,650.52 × 9,720.88
  4. Step 4: Simplify right side
    15,686.56x = 210,462,106.86
  5. Step 5: Solve for x
    x = 210,462,106.86/15,686.56
  6. Step 6: Final answer
    x = 13,416.72

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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.