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Finding the Fourth Proportional to 78,318.75, 108,079.98 and 42,508.77

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Solution

The fourth proportional to 78,318.75, 108,079.98 and 42,508.77 is: 58,662.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,318.75 : 108,079.98 = 42,508.77 : x
  2. Step 2: Convert to fraction form
    78,318.75/108,079.98 = 42,508.77/x
  3. Step 3: Cross multiply
    78,318.75x = 108,079.98 × 42,508.77
  4. Step 4: Simplify right side
    78,318.75x = 4,594,346,446.72
  5. Step 5: Solve for x
    x = 4,594,346,446.72/78,318.75
  6. Step 6: Final answer
    x = 58,662.15

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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.