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Finding the Fourth Proportional to 136,687.70, 205,031.55 and 86,824.10

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Solution

The fourth proportional to 136,687.70, 205,031.55 and 86,824.10 is: 130,236.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,687.70 : 205,031.55 = 86,824.10 : x
  2. Step 2: Convert to fraction form
    136,687.70/205,031.55 = 86,824.10/x
  3. Step 3: Cross multiply
    136,687.70x = 205,031.55 × 86,824.10
  4. Step 4: Simplify right side
    136,687.70x = 17,801,679,800.36
  5. Step 5: Solve for x
    x = 17,801,679,800.36/136,687.70
  6. Step 6: Final answer
    x = 130,236.15

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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.