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Finding the Fourth Proportional to 136,871.52, 189,013.10 and 129,417.08

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Solution

The fourth proportional to 136,871.52, 189,013.10 and 129,417.08 is: 178,718.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,871.52 : 189,013.10 = 129,417.08 : x
  2. Step 2: Convert to fraction form
    136,871.52/189,013.10 = 129,417.08/x
  3. Step 3: Cross multiply
    136,871.52x = 189,013.10 × 129,417.08
  4. Step 4: Simplify right side
    136,871.52x = 24,461,523,483.75
  5. Step 5: Solve for x
    x = 24,461,523,483.75/136,871.52
  6. Step 6: Final answer
    x = 178,718.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.