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Finding the Fourth Proportional to 979.17, 1,351.49 and 664.95

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Solution

The fourth proportional to 979.17, 1,351.49 and 664.95 is: 917.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.17 : 1,351.49 = 664.95 : x
  2. Step 2: Convert to fraction form
    979.17/1,351.49 = 664.95/x
  3. Step 3: Cross multiply
    979.17x = 1,351.49 × 664.95
  4. Step 4: Simplify right side
    979.17x = 898,675.02
  5. Step 5: Solve for x
    x = 898,675.02/979.17
  6. Step 6: Final answer
    x = 917.80

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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.