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Finding the Fourth Proportional to 458,131.80, 687,197.70 and 205,411.80

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Solution

The fourth proportional to 458,131.80, 687,197.70 and 205,411.80 is: 308,117.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,131.80 : 687,197.70 = 205,411.80 : x
  2. Step 2: Convert to fraction form
    458,131.80/687,197.70 = 205,411.80/x
  3. Step 3: Cross multiply
    458,131.80x = 687,197.70 × 205,411.80
  4. Step 4: Simplify right side
    458,131.80x = 141,158,516,512.86
  5. Step 5: Solve for x
    x = 141,158,516,512.86/458,131.80
  6. Step 6: Final answer
    x = 308,117.70

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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.