Home / 138,972.30-208,458.45-75,986.70

Finding the Fourth Proportional to 138,972.30, 208,458.45 and 75,986.70

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Solution

The fourth proportional to 138,972.30, 208,458.45 and 75,986.70 is: 113,980.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,972.30 : 208,458.45 = 75,986.70 : x
  2. Step 2: Convert to fraction form
    138,972.30/208,458.45 = 75,986.70/x
  3. Step 3: Cross multiply
    138,972.30x = 208,458.45 × 75,986.70
  4. Step 4: Simplify right side
    138,972.30x = 15,840,069,702.62
  5. Step 5: Solve for x
    x = 15,840,069,702.62/138,972.30
  6. Step 6: Final answer
    x = 113,980.05

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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.