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Finding the Fourth Proportional to 663.35, 915.53 and 383.54

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Solution

The fourth proportional to 663.35, 915.53 and 383.54 is: 529.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.35 : 915.53 = 383.54 : x
  2. Step 2: Convert to fraction form
    663.35/915.53 = 383.54/x
  3. Step 3: Cross multiply
    663.35x = 915.53 × 383.54
  4. Step 4: Simplify right side
    663.35x = 351,138.76
  5. Step 5: Solve for x
    x = 351,138.76/663.35
  6. Step 6: Final answer
    x = 529.34

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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.