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Finding the Fourth Proportional to 663.55, 915.58 and 383.80

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Solution

The fourth proportional to 663.55, 915.58 and 383.80 is: 529.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.55 : 915.58 = 383.80 : x
  2. Step 2: Convert to fraction form
    663.55/915.58 = 383.80/x
  3. Step 3: Cross multiply
    663.55x = 915.58 × 383.80
  4. Step 4: Simplify right side
    663.55x = 351,399.60
  5. Step 5: Solve for x
    x = 351,399.60/663.55
  6. Step 6: Final answer
    x = 529.58

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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.