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Finding the Fourth Proportional to 660.17, 991.28 and 630.95

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Solution

The fourth proportional to 660.17, 991.28 and 630.95 is: 947.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.17 : 991.28 = 630.95 : x
  2. Step 2: Convert to fraction form
    660.17/991.28 = 630.95/x
  3. Step 3: Cross multiply
    660.17x = 991.28 × 630.95
  4. Step 4: Simplify right side
    660.17x = 625,448.12
  5. Step 5: Solve for x
    x = 625,448.12/660.17
  6. Step 6: Final answer
    x = 947.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.