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Finding the Fourth Proportional to 138,603.91, 191,279.91 and 78,173.28

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Solution

The fourth proportional to 138,603.91, 191,279.91 and 78,173.28 is: 107,882.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,603.91 : 191,279.91 = 78,173.28 : x
  2. Step 2: Convert to fraction form
    138,603.91/191,279.91 = 78,173.28/x
  3. Step 3: Cross multiply
    138,603.91x = 191,279.91 × 78,173.28
  4. Step 4: Simplify right side
    138,603.91x = 14,952,977,962.80
  5. Step 5: Solve for x
    x = 14,952,977,962.80/138,603.91
  6. Step 6: Final answer
    x = 107,882.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.