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Finding the Fourth Proportional to 136,981.20, 205,510.20 and 66,862.80

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Solution

The fourth proportional to 136,981.20, 205,510.20 and 66,862.80 is: 100,312.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,981.20 : 205,510.20 = 66,862.80 : x
  2. Step 2: Convert to fraction form
    136,981.20/205,510.20 = 66,862.80/x
  3. Step 3: Cross multiply
    136,981.20x = 205,510.20 × 66,862.80
  4. Step 4: Simplify right side
    136,981.20x = 13,740,987,400.56
  5. Step 5: Solve for x
    x = 13,740,987,400.56/136,981.20
  6. Step 6: Final answer
    x = 100,312.94

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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.