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Finding the Fourth Proportional to 113,990, 157,306.26 and 63,689

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Solution

The fourth proportional to 113,990, 157,306.26 and 63,689 is: 87,890.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,990 : 157,306.26 = 63,689 : x
  2. Step 2: Convert to fraction form
    113,990/157,306.26 = 63,689/x
  3. Step 3: Cross multiply
    113,990x = 157,306.26 × 63,689
  4. Step 4: Simplify right side
    113,990x = 10,018,678,393.14
  5. Step 5: Solve for x
    x = 10,018,678,393.14/113,990
  6. Step 6: Final answer
    x = 87,890.85

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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.