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Finding the Fourth Proportional to 870.82, 1,304.20 and 686.95

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Solution

The fourth proportional to 870.82, 1,304.20 and 686.95 is: 1,028.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.82 : 1,304.20 = 686.95 : x
  2. Step 2: Convert to fraction form
    870.82/1,304.20 = 686.95/x
  3. Step 3: Cross multiply
    870.82x = 1,304.20 × 686.95
  4. Step 4: Simplify right side
    870.82x = 895,920.19
  5. Step 5: Solve for x
    x = 895,920.19/870.82
  6. Step 6: Final answer
    x = 1,028.82

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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.