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Finding the Fourth Proportional to 86,275.80, 129,369.94 and 39,488.60

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Solution

The fourth proportional to 86,275.80, 129,369.94 and 39,488.60 is: 59,212.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,275.80 : 129,369.94 = 39,488.60 : x
  2. Step 2: Convert to fraction form
    86,275.80/129,369.94 = 39,488.60/x
  3. Step 3: Cross multiply
    86,275.80x = 129,369.94 × 39,488.60
  4. Step 4: Simplify right side
    86,275.80x = 5,108,637,812.68
  5. Step 5: Solve for x
    x = 5,108,637,812.68/86,275.80
  6. Step 6: Final answer
    x = 59,212.87

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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.