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Finding the Fourth Proportional to 971.80, 1,340.76 and 622.70

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Solution

The fourth proportional to 971.80, 1,340.76 and 622.70 is: 859.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.80 : 1,340.76 = 622.70 : x
  2. Step 2: Convert to fraction form
    971.80/1,340.76 = 622.70/x
  3. Step 3: Cross multiply
    971.80x = 1,340.76 × 622.70
  4. Step 4: Simplify right side
    971.80x = 834,891.25
  5. Step 5: Solve for x
    x = 834,891.25/971.80
  6. Step 6: Final answer
    x = 859.12

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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.