Home / 20,489.60-28,265.28-15,772.16

Finding the Fourth Proportional to 20,489.60, 28,265.28 and 15,772.16

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Solution

The fourth proportional to 20,489.60, 28,265.28 and 15,772.16 is: 21,757.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.60 : 28,265.28 = 15,772.16 : x
  2. Step 2: Convert to fraction form
    20,489.60/28,265.28 = 15,772.16/x
  3. Step 3: Cross multiply
    20,489.60x = 28,265.28 × 15,772.16
  4. Step 4: Simplify right side
    20,489.60x = 445,804,518.60
  5. Step 5: Solve for x
    x = 445,804,518.60/20,489.60
  6. Step 6: Final answer
    x = 21,757.60

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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.