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Finding the Fourth Proportional to 78,319.70, 108,078.29 and 42,508.95

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Solution

The fourth proportional to 78,319.70, 108,078.29 and 42,508.95 is: 58,660.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,319.70 : 108,078.29 = 42,508.95 : x
  2. Step 2: Convert to fraction form
    78,319.70/108,078.29 = 42,508.95/x
  3. Step 3: Cross multiply
    78,319.70x = 108,078.29 × 42,508.95
  4. Step 4: Simplify right side
    78,319.70x = 4,594,294,167.27
  5. Step 5: Solve for x
    x = 4,594,294,167.27/78,319.70
  6. Step 6: Final answer
    x = 58,660.77

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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.