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Finding the Fourth Proportional to 915.46, 1,264.30 and 718.66

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Solution

The fourth proportional to 915.46, 1,264.30 and 718.66 is: 992.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.46 : 1,264.30 = 718.66 : x
  2. Step 2: Convert to fraction form
    915.46/1,264.30 = 718.66/x
  3. Step 3: Cross multiply
    915.46x = 1,264.30 × 718.66
  4. Step 4: Simplify right side
    915.46x = 908,601.84
  5. Step 5: Solve for x
    x = 908,601.84/915.46
  6. Step 6: Final answer
    x = 992.51

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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.