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Finding the Fourth Proportional to 138,697.30, 208,045.95 and 115,369.30

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Solution

The fourth proportional to 138,697.30, 208,045.95 and 115,369.30 is: 173,053.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,697.30 : 208,045.95 = 115,369.30 : x
  2. Step 2: Convert to fraction form
    138,697.30/208,045.95 = 115,369.30/x
  3. Step 3: Cross multiply
    138,697.30x = 208,045.95 × 115,369.30
  4. Step 4: Simplify right side
    138,697.30x = 24,002,115,619.34
  5. Step 5: Solve for x
    x = 24,002,115,619.34/138,697.30
  6. Step 6: Final answer
    x = 173,053.95

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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.