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Finding the Fourth Proportional to 691.80, 1,036.50 and 660.95

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Solution

The fourth proportional to 691.80, 1,036.50 and 660.95 is: 990.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.80 : 1,036.50 = 660.95 : x
  2. Step 2: Convert to fraction form
    691.80/1,036.50 = 660.95/x
  3. Step 3: Cross multiply
    691.80x = 1,036.50 × 660.95
  4. Step 4: Simplify right side
    691.80x = 685,069.49
  5. Step 5: Solve for x
    x = 685,069.49/691.80
  6. Step 6: Final answer
    x = 990.27

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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.