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Finding the Fourth Proportional to 461,135.40, 691,703.10 and 128,711.40

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Solution

The fourth proportional to 461,135.40, 691,703.10 and 128,711.40 is: 193,067.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    461,135.40 : 691,703.10 = 128,711.40 : x
  2. Step 2: Convert to fraction form
    461,135.40/691,703.10 = 128,711.40/x
  3. Step 3: Cross multiply
    461,135.40x = 691,703.10 × 128,711.40
  4. Step 4: Simplify right side
    461,135.40x = 89,030,074,385.34
  5. Step 5: Solve for x
    x = 89,030,074,385.34/461,135.40
  6. Step 6: Final answer
    x = 193,067.10

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Similar ratio
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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.