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Finding the Fourth Proportional to 616.55, 851.13 and 421.09

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Solution

The fourth proportional to 616.55, 851.13 and 421.09 is: 581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.55 : 851.13 = 421.09 : x
  2. Step 2: Convert to fraction form
    616.55/851.13 = 421.09/x
  3. Step 3: Cross multiply
    616.55x = 851.13 × 421.09
  4. Step 4: Simplify right side
    616.55x = 358,400.20
  5. Step 5: Solve for x
    x = 358,400.20/616.55
  6. Step 6: Final answer
    x = 581.30

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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.