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Finding the Fourth Proportional to 915.65, 1,262.12 and 716.13

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Solution

The fourth proportional to 915.65, 1,262.12 and 716.13 is: 987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.65 : 1,262.12 = 716.13 : x
  2. Step 2: Convert to fraction form
    915.65/1,262.12 = 716.13/x
  3. Step 3: Cross multiply
    915.65x = 1,262.12 × 716.13
  4. Step 4: Simplify right side
    915.65x = 903,843.79
  5. Step 5: Solve for x
    x = 903,843.79/915.65
  6. Step 6: Final answer
    x = 987.10

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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.