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Finding the Fourth Proportional to 261,490.30, 392,494.65 and 128,520.70

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Solution

The fourth proportional to 261,490.30, 392,494.65 and 128,520.70 is: 192,908.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,490.30 : 392,494.65 = 128,520.70 : x
  2. Step 2: Convert to fraction form
    261,490.30/392,494.65 = 128,520.70/x
  3. Step 3: Cross multiply
    261,490.30x = 392,494.65 × 128,520.70
  4. Step 4: Simplify right side
    261,490.30x = 50,443,687,164.26
  5. Step 5: Solve for x
    x = 50,443,687,164.26/261,490.30
  6. Step 6: Final answer
    x = 192,908.45

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1.5x scale

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.