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Finding the Fourth Proportional to 660.33, 915.42 and 646.95

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Solution

The fourth proportional to 660.33, 915.42 and 646.95 is: 896.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.33 : 915.42 = 646.95 : x
  2. Step 2: Convert to fraction form
    660.33/915.42 = 646.95/x
  3. Step 3: Cross multiply
    660.33x = 915.42 × 646.95
  4. Step 4: Simplify right side
    660.33x = 592,230.97
  5. Step 5: Solve for x
    x = 592,230.97/660.33
  6. Step 6: Final answer
    x = 896.87

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.