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Finding the Fourth Proportional to 915.38, 1,373.06 and 338.25

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Solution

The fourth proportional to 915.38, 1,373.06 and 338.25 is: 507.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.38 : 1,373.06 = 338.25 : x
  2. Step 2: Convert to fraction form
    915.38/1,373.06 = 338.25/x
  3. Step 3: Cross multiply
    915.38x = 1,373.06 × 338.25
  4. Step 4: Simplify right side
    915.38x = 464,438.39
  5. Step 5: Solve for x
    x = 464,438.39/915.38
  6. Step 6: Final answer
    x = 507.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.