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Finding the Fourth Proportional to 28,215.52, 38,934.80 and 15,639.20

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Solution

The fourth proportional to 28,215.52, 38,934.80 and 15,639.20 is: 21,580.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,215.52 : 38,934.80 = 15,639.20 : x
  2. Step 2: Convert to fraction form
    28,215.52/38,934.80 = 15,639.20/x
  3. Step 3: Cross multiply
    28,215.52x = 38,934.80 × 15,639.20
  4. Step 4: Simplify right side
    28,215.52x = 608,909,124.16
  5. Step 5: Solve for x
    x = 608,909,124.16/28,215.52
  6. Step 6: Final answer
    x = 21,580.65

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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.