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Finding the Fourth Proportional to 308,785.40, 426,131.50 and 172,818.20

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Solution

The fourth proportional to 308,785.40, 426,131.50 and 172,818.20 is: 238,493.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,785.40 : 426,131.50 = 172,818.20 : x
  2. Step 2: Convert to fraction form
    308,785.40/426,131.50 = 172,818.20/x
  3. Step 3: Cross multiply
    308,785.40x = 426,131.50 × 172,818.20
  4. Step 4: Simplify right side
    308,785.40x = 73,643,278,793.30
  5. Step 5: Solve for x
    x = 73,643,278,793.30/308,785.40
  6. Step 6: Final answer
    x = 238,493.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.