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Finding the Fourth Proportional to 139,985.70, 209,978.55 and 79,952.55

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Solution

The fourth proportional to 139,985.70, 209,978.55 and 79,952.55 is: 119,928.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,985.70 : 209,978.55 = 79,952.55 : x
  2. Step 2: Convert to fraction form
    139,985.70/209,978.55 = 79,952.55/x
  3. Step 3: Cross multiply
    139,985.70x = 209,978.55 × 79,952.55
  4. Step 4: Simplify right side
    139,985.70x = 16,788,320,517.80
  5. Step 5: Solve for x
    x = 16,788,320,517.80/139,985.70
  6. Step 6: Final answer
    x = 119,928.83

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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.