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Finding the Fourth Proportional to 86,007.60, 129,030.60 and 67,345.20

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Solution

The fourth proportional to 86,007.60, 129,030.60 and 67,345.20 is: 101,032.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,007.60 : 129,030.60 = 67,345.20 : x
  2. Step 2: Convert to fraction form
    86,007.60/129,030.60 = 67,345.20/x
  3. Step 3: Cross multiply
    86,007.60x = 129,030.60 × 67,345.20
  4. Step 4: Simplify right side
    86,007.60x = 8,689,591,563.12
  5. Step 5: Solve for x
    x = 8,689,591,563.12/86,007.60
  6. Step 6: Final answer
    x = 101,032.83

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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.