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Finding the Fourth Proportional to 261,786.60, 392,679.90 and 128,687.40

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Solution

The fourth proportional to 261,786.60, 392,679.90 and 128,687.40 is: 193,031.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,786.60 : 392,679.90 = 128,687.40 : x
  2. Step 2: Convert to fraction form
    261,786.60/392,679.90 = 128,687.40/x
  3. Step 3: Cross multiply
    261,786.60x = 392,679.90 × 128,687.40
  4. Step 4: Simplify right side
    261,786.60x = 50,532,955,363.26
  5. Step 5: Solve for x
    x = 50,532,955,363.26/261,786.60
  6. Step 6: Final answer
    x = 193,031.10

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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.