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Finding the Fourth Proportional to 915.04, 1,262.78 and 718.20

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Solution

The fourth proportional to 915.04, 1,262.78 and 718.20 is: 991.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.04 : 1,262.78 = 718.20 : x
  2. Step 2: Convert to fraction form
    915.04/1,262.78 = 718.20/x
  3. Step 3: Cross multiply
    915.04x = 1,262.78 × 718.20
  4. Step 4: Simplify right side
    915.04x = 906,928.60
  5. Step 5: Solve for x
    x = 906,928.60/915.04
  6. Step 6: Final answer
    x = 991.14

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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.