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Finding the Fourth Proportional to 915.04, 1,372.76 and 265.72

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Solution

The fourth proportional to 915.04, 1,372.76 and 265.72 is: 398.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.04 : 1,372.76 = 265.72 : x
  2. Step 2: Convert to fraction form
    915.04/1,372.76 = 265.72/x
  3. Step 3: Cross multiply
    915.04x = 1,372.76 × 265.72
  4. Step 4: Simplify right side
    915.04x = 364,769.79
  5. Step 5: Solve for x
    x = 364,769.79/915.04
  6. Step 6: Final answer
    x = 398.64

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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.