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Finding the Fourth Proportional to 28,439.92, 42,659.88 and 7,663.42

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Solution

The fourth proportional to 28,439.92, 42,659.88 and 7,663.42 is: 11,495.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,439.92 : 42,659.88 = 7,663.42 : x
  2. Step 2: Convert to fraction form
    28,439.92/42,659.88 = 7,663.42/x
  3. Step 3: Cross multiply
    28,439.92x = 42,659.88 × 7,663.42
  4. Step 4: Simplify right side
    28,439.92x = 326,920,577.59
  5. Step 5: Solve for x
    x = 326,920,577.59/28,439.92
  6. Step 6: Final answer
    x = 11,495.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.