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Finding the Fourth Proportional to 86,585.90, 129,660.15 and 69,089.90

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Solution

The fourth proportional to 86,585.90, 129,660.15 and 69,089.90 is: 103,460.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,585.90 : 129,660.15 = 69,089.90 : x
  2. Step 2: Convert to fraction form
    86,585.90/129,660.15 = 69,089.90/x
  3. Step 3: Cross multiply
    86,585.90x = 129,660.15 × 69,089.90
  4. Step 4: Simplify right side
    86,585.90x = 8,958,206,797.49
  5. Step 5: Solve for x
    x = 8,958,206,797.49/86,585.90
  6. Step 6: Final answer
    x = 103,460.34

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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.