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Finding the Fourth Proportional to 86,640.60, 129,985.20 and 36,744.60

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Solution

The fourth proportional to 86,640.60, 129,985.20 and 36,744.60 is: 55,127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,640.60 : 129,985.20 = 36,744.60 : x
  2. Step 2: Convert to fraction form
    86,640.60/129,985.20 = 36,744.60/x
  3. Step 3: Cross multiply
    86,640.60x = 129,985.20 × 36,744.60
  4. Step 4: Simplify right side
    86,640.60x = 4,776,254,179.92
  5. Step 5: Solve for x
    x = 4,776,254,179.92/86,640.60
  6. Step 6: Final answer
    x = 55,127.21

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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.