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Finding the Fourth Proportional to 663.20, 915.20 and 368.46

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Solution

The fourth proportional to 663.20, 915.20 and 368.46 is: 508.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.20 : 915.20 = 368.46 : x
  2. Step 2: Convert to fraction form
    663.20/915.20 = 368.46/x
  3. Step 3: Cross multiply
    663.20x = 915.20 × 368.46
  4. Step 4: Simplify right side
    663.20x = 337,212.08
  5. Step 5: Solve for x
    x = 337,212.08/663.20
  6. Step 6: Final answer
    x = 508.47

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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.