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Finding the Fourth Proportional to 138,345.80, 207,518.70 and 78,312.65

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Solution

The fourth proportional to 138,345.80, 207,518.70 and 78,312.65 is: 117,468.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,345.80 : 207,518.70 = 78,312.65 : x
  2. Step 2: Convert to fraction form
    138,345.80/207,518.70 = 78,312.65/x
  3. Step 3: Cross multiply
    138,345.80x = 207,518.70 × 78,312.65
  4. Step 4: Simplify right side
    138,345.80x = 16,251,339,321.56
  5. Step 5: Solve for x
    x = 16,251,339,321.56/138,345.80
  6. Step 6: Final answer
    x = 117,468.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.