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Finding the Fourth Proportional to 915.22, 1,262.75 and 616.89

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Solution

The fourth proportional to 915.22, 1,262.75 and 616.89 is: 851.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.22 : 1,262.75 = 616.89 : x
  2. Step 2: Convert to fraction form
    915.22/1,262.75 = 616.89/x
  3. Step 3: Cross multiply
    915.22x = 1,262.75 × 616.89
  4. Step 4: Simplify right side
    915.22x = 778,977.85
  5. Step 5: Solve for x
    x = 778,977.85/915.22
  6. Step 6: Final answer
    x = 851.14

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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.