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Finding the Fourth Proportional to 141,990.70, 212,726.85 and 86,521.90

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Solution

The fourth proportional to 141,990.70, 212,726.85 and 86,521.90 is: 129,624.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,990.70 : 212,726.85 = 86,521.90 : x
  2. Step 2: Convert to fraction form
    141,990.70/212,726.85 = 86,521.90/x
  3. Step 3: Cross multiply
    141,990.70x = 212,726.85 × 86,521.90
  4. Step 4: Simplify right side
    141,990.70x = 18,405,531,243.02
  5. Step 5: Solve for x
    x = 18,405,531,243.02/141,990.70
  6. Step 6: Final answer
    x = 129,624.91

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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.