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Finding the Fourth Proportional to 139,426.80, 209,140.20 and 86,865.90

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Solution

The fourth proportional to 139,426.80, 209,140.20 and 86,865.90 is: 130,298.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,426.80 : 209,140.20 = 86,865.90 : x
  2. Step 2: Convert to fraction form
    139,426.80/209,140.20 = 86,865.90/x
  3. Step 3: Cross multiply
    139,426.80x = 209,140.20 × 86,865.90
  4. Step 4: Simplify right side
    139,426.80x = 18,167,151,699.18
  5. Step 5: Solve for x
    x = 18,167,151,699.18/139,426.80
  6. Step 6: Final answer
    x = 130,298.85

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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.