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Finding the Fourth Proportional to 78,630.29, 108,511.53 and 42,820.31

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Solution

The fourth proportional to 78,630.29, 108,511.53 and 42,820.31 is: 59,092.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,630.29 : 108,511.53 = 42,820.31 : x
  2. Step 2: Convert to fraction form
    78,630.29/108,511.53 = 42,820.31/x
  3. Step 3: Cross multiply
    78,630.29x = 108,511.53 × 42,820.31
  4. Step 4: Simplify right side
    78,630.29x = 4,646,497,704.74
  5. Step 5: Solve for x
    x = 4,646,497,704.74/78,630.29
  6. Step 6: Final answer
    x = 59,092.97

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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.