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Finding the Fourth Proportional to 398,397.11, 549,768.42 and 217,108.49

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Solution

The fourth proportional to 398,397.11, 549,768.42 and 217,108.49 is: 299,599.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,397.11 : 549,768.42 = 217,108.49 : x
  2. Step 2: Convert to fraction form
    398,397.11/549,768.42 = 217,108.49/x
  3. Step 3: Cross multiply
    398,397.11x = 549,768.42 × 217,108.49
  4. Step 4: Simplify right side
    398,397.11x = 119,359,388,767.04
  5. Step 5: Solve for x
    x = 119,359,388,767.04/398,397.11
  6. Step 6: Final answer
    x = 299,599.04

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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.