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Finding the Fourth Proportional to 398,418.72, 549,801.78 and 217,126.76

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Solution

The fourth proportional to 398,418.72, 549,801.78 and 217,126.76 is: 299,626.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,418.72 : 549,801.78 = 217,126.76 : x
  2. Step 2: Convert to fraction form
    398,418.72/549,801.78 = 217,126.76/x
  3. Step 3: Cross multiply
    398,418.72x = 549,801.78 × 217,126.76
  4. Step 4: Simplify right side
    398,418.72x = 119,376,676,384.62
  5. Step 5: Solve for x
    x = 119,376,676,384.62/398,418.72
  6. Step 6: Final answer
    x = 299,626.17

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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.