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Finding the Fourth Proportional to 28,188.88, 38,901.88 and 15,613.62

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Solution

The fourth proportional to 28,188.88, 38,901.88 and 15,613.62 is: 21,547.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,188.88 : 38,901.88 = 15,613.62 : x
  2. Step 2: Convert to fraction form
    28,188.88/38,901.88 = 15,613.62/x
  3. Step 3: Cross multiply
    28,188.88x = 38,901.88 × 15,613.62
  4. Step 4: Simplify right side
    28,188.88x = 607,399,171.61
  5. Step 5: Solve for x
    x = 607,399,171.61/28,188.88
  6. Step 6: Final answer
    x = 21,547.47

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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.