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Finding the Fourth Proportional to 136,616.60, 204,706.20 and 86,607.20

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Solution

The fourth proportional to 136,616.60, 204,706.20 and 86,607.20 is: 129,772.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,616.60 : 204,706.20 = 86,607.20 : x
  2. Step 2: Convert to fraction form
    136,616.60/204,706.20 = 86,607.20/x
  3. Step 3: Cross multiply
    136,616.60x = 204,706.20 × 86,607.20
  4. Step 4: Simplify right side
    136,616.60x = 17,729,030,804.64
  5. Step 5: Solve for x
    x = 17,729,030,804.64/136,616.60
  6. Step 6: Final answer
    x = 129,772.16

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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.