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Finding the Fourth Proportional to 86,620.70, 129,821.70 and 42,151.70

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Solution

The fourth proportional to 86,620.70, 129,821.70 and 42,151.70 is: 63,174.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.70 : 129,821.70 = 42,151.70 : x
  2. Step 2: Convert to fraction form
    86,620.70/129,821.70 = 42,151.70/x
  3. Step 3: Cross multiply
    86,620.70x = 129,821.70 × 42,151.70
  4. Step 4: Simplify right side
    86,620.70x = 5,472,205,351.89
  5. Step 5: Solve for x
    x = 5,472,205,351.89/86,620.70
  6. Step 6: Final answer
    x = 63,174.34

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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.