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Finding the Fourth Proportional to 78,520.64, 108,359.88 and 42,711.44

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Solution

The fourth proportional to 78,520.64, 108,359.88 and 42,711.44 is: 58,942.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,520.64 : 108,359.88 = 42,711.44 : x
  2. Step 2: Convert to fraction form
    78,520.64/108,359.88 = 42,711.44/x
  3. Step 3: Cross multiply
    78,520.64x = 108,359.88 × 42,711.44
  4. Step 4: Simplify right side
    78,520.64x = 4,628,206,513.03
  5. Step 5: Solve for x
    x = 4,628,206,513.03/78,520.64
  6. Step 6: Final answer
    x = 58,942.55

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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.