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Finding the Fourth Proportional to 915.65, 1,263.41 and 522.66

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Solution

The fourth proportional to 915.65, 1,263.41 and 522.66 is: 721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.65 : 1,263.41 = 522.66 : x
  2. Step 2: Convert to fraction form
    915.65/1,263.41 = 522.66/x
  3. Step 3: Cross multiply
    915.65x = 1,263.41 × 522.66
  4. Step 4: Simplify right side
    915.65x = 660,333.87
  5. Step 5: Solve for x
    x = 660,333.87/915.65
  6. Step 6: Final answer
    x = 721.16

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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.