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Finding the Fourth Proportional to 139,337.76, 192,279.88 and 78,907.12

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Solution

The fourth proportional to 139,337.76, 192,279.88 and 78,907.12 is: 108,888.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,337.76 : 192,279.88 = 78,907.12 : x
  2. Step 2: Convert to fraction form
    139,337.76/192,279.88 = 78,907.12/x
  3. Step 3: Cross multiply
    139,337.76x = 192,279.88 × 78,907.12
  4. Step 4: Simplify right side
    139,337.76x = 15,172,251,564.75
  5. Step 5: Solve for x
    x = 15,172,251,564.75/139,337.76
  6. Step 6: Final answer
    x = 108,888.30

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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.