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Finding the Fourth Proportional to 86,517.40, 129,800.40 and 42,145.60

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Solution

The fourth proportional to 86,517.40, 129,800.40 and 42,145.60 is: 63,230.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,517.40 : 129,800.40 = 42,145.60 : x
  2. Step 2: Convert to fraction form
    86,517.40/129,800.40 = 42,145.60/x
  3. Step 3: Cross multiply
    86,517.40x = 129,800.40 × 42,145.60
  4. Step 4: Simplify right side
    86,517.40x = 5,470,515,738.24
  5. Step 5: Solve for x
    x = 5,470,515,738.24/86,517.40
  6. Step 6: Final answer
    x = 63,230.24

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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.