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Finding the Fourth Proportional to 398,635.28, 550,120.98 and 217,345.73

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Solution

The fourth proportional to 398,635.28, 550,120.98 and 217,345.73 is: 299,939.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,635.28 : 550,120.98 = 217,345.73 : x
  2. Step 2: Convert to fraction form
    398,635.28/550,120.98 = 217,345.73/x
  3. Step 3: Cross multiply
    398,635.28x = 550,120.98 × 217,345.73
  4. Step 4: Simplify right side
    398,635.28x = 119,566,445,986.42
  5. Step 5: Solve for x
    x = 119,566,445,986.42/398,635.28
  6. Step 6: Final answer
    x = 299,939.45

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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.