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Finding the Fourth Proportional to 86,258.40, 129,310.80 and 76,927.20

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Solution

The fourth proportional to 86,258.40, 129,310.80 and 76,927.20 is: 115,322.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,258.40 : 129,310.80 = 76,927.20 : x
  2. Step 2: Convert to fraction form
    86,258.40/129,310.80 = 76,927.20/x
  3. Step 3: Cross multiply
    86,258.40x = 129,310.80 × 76,927.20
  4. Step 4: Simplify right side
    86,258.40x = 9,947,517,773.76
  5. Step 5: Solve for x
    x = 9,947,517,773.76/86,258.40
  6. Step 6: Final answer
    x = 115,322.31

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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.