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Finding the Fourth Proportional to 663.77, 916.31 and 398.34

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Solution

The fourth proportional to 663.77, 916.31 and 398.34 is: 549.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.77 : 916.31 = 398.34 : x
  2. Step 2: Convert to fraction form
    663.77/916.31 = 398.34/x
  3. Step 3: Cross multiply
    663.77x = 916.31 × 398.34
  4. Step 4: Simplify right side
    663.77x = 365,003.92
  5. Step 5: Solve for x
    x = 365,003.92/663.77
  6. Step 6: Final answer
    x = 549.89

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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.