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Finding the Fourth Proportional to 663.12, 915.12 and 383.38

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Solution

The fourth proportional to 663.12, 915.12 and 383.38 is: 529.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.12 : 915.12 = 383.38 : x
  2. Step 2: Convert to fraction form
    663.12/915.12 = 383.38/x
  3. Step 3: Cross multiply
    663.12x = 915.12 × 383.38
  4. Step 4: Simplify right side
    663.12x = 350,836.42
  5. Step 5: Solve for x
    x = 350,836.42/663.12
  6. Step 6: Final answer
    x = 529.07

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Double scale
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1.5x scale

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.