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Finding the Fourth Proportional to 86,727.70, 130,005.15 and 39,898.90

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Solution

The fourth proportional to 86,727.70, 130,005.15 and 39,898.90 is: 59,808.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,727.70 : 130,005.15 = 39,898.90 : x
  2. Step 2: Convert to fraction form
    86,727.70/130,005.15 = 39,898.90/x
  3. Step 3: Cross multiply
    86,727.70x = 130,005.15 × 39,898.90
  4. Step 4: Simplify right side
    86,727.70x = 5,187,062,479.34
  5. Step 5: Solve for x
    x = 5,187,062,479.34/86,727.70
  6. Step 6: Final answer
    x = 59,808.60

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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.