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Finding the Fourth Proportional to 460,853.80, 691,280.70 and 128,429.80

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Solution

The fourth proportional to 460,853.80, 691,280.70 and 128,429.80 is: 192,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    460,853.80 : 691,280.70 = 128,429.80 : x
  2. Step 2: Convert to fraction form
    460,853.80/691,280.70 = 128,429.80/x
  3. Step 3: Cross multiply
    460,853.80x = 691,280.70 × 128,429.80
  4. Step 4: Simplify right side
    460,853.80x = 88,781,042,044.86
  5. Step 5: Solve for x
    x = 88,781,042,044.86/460,853.80
  6. Step 6: Final answer
    x = 192,644.70

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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.