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Finding the Fourth Proportional to 915.29, 1,262.55 and 649.35

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Solution

The fourth proportional to 915.29, 1,262.55 and 649.35 is: 895.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.29 : 1,262.55 = 649.35 : x
  2. Step 2: Convert to fraction form
    915.29/1,262.55 = 649.35/x
  3. Step 3: Cross multiply
    915.29x = 1,262.55 × 649.35
  4. Step 4: Simplify right side
    915.29x = 819,836.84
  5. Step 5: Solve for x
    x = 819,836.84/915.29
  6. Step 6: Final answer
    x = 895.71

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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.