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Finding the Fourth Proportional to 616.74, 851.40 and 421.26

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Solution

The fourth proportional to 616.74, 851.40 and 421.26 is: 581.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.74 : 851.40 = 421.26 : x
  2. Step 2: Convert to fraction form
    616.74/851.40 = 421.26/x
  3. Step 3: Cross multiply
    616.74x = 851.40 × 421.26
  4. Step 4: Simplify right side
    616.74x = 358,660.76
  5. Step 5: Solve for x
    x = 358,660.76/616.74
  6. Step 6: Final answer
    x = 581.54

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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.