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Finding the Fourth Proportional to 138,590.80, 207,907.98 and 45,074.68

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Solution

The fourth proportional to 138,590.80, 207,907.98 and 45,074.68 is: 67,619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,590.80 : 207,907.98 = 45,074.68 : x
  2. Step 2: Convert to fraction form
    138,590.80/207,907.98 = 45,074.68/x
  3. Step 3: Cross multiply
    138,590.80x = 207,907.98 × 45,074.68
  4. Step 4: Simplify right side
    138,590.80x = 9,371,385,667.95
  5. Step 5: Solve for x
    x = 9,371,385,667.95/138,590.80
  6. Step 6: Final answer
    x = 67,619.10

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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.