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Finding the Fourth Proportional to 663.34, 915.42 and 383.62

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Solution

The fourth proportional to 663.34, 915.42 and 383.62 is: 529.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.34 : 915.42 = 383.62 : x
  2. Step 2: Convert to fraction form
    663.34/915.42 = 383.62/x
  3. Step 3: Cross multiply
    663.34x = 915.42 × 383.62
  4. Step 4: Simplify right side
    663.34x = 351,173.42
  5. Step 5: Solve for x
    x = 351,173.42/663.34
  6. Step 6: Final answer
    x = 529.40

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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.