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Finding the Fourth Proportional to 42,357.60, 63,515.88 and 12,769.92

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Solution

The fourth proportional to 42,357.60, 63,515.88 and 12,769.92 is: 19,148.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,357.60 : 63,515.88 = 12,769.92 : x
  2. Step 2: Convert to fraction form
    42,357.60/63,515.88 = 12,769.92/x
  3. Step 3: Cross multiply
    42,357.60x = 63,515.88 × 12,769.92
  4. Step 4: Simplify right side
    42,357.60x = 811,092,706.33
  5. Step 5: Solve for x
    x = 811,092,706.33/42,357.60
  6. Step 6: Final answer
    x = 19,148.69

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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.