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Finding the Fourth Proportional to 971.12, 1,340.52 and 711.20

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Solution

The fourth proportional to 971.12, 1,340.52 and 711.20 is: 981.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.12 : 1,340.52 = 711.20 : x
  2. Step 2: Convert to fraction form
    971.12/1,340.52 = 711.20/x
  3. Step 3: Cross multiply
    971.12x = 1,340.52 × 711.20
  4. Step 4: Simplify right side
    971.12x = 953,377.82
  5. Step 5: Solve for x
    x = 953,377.82/971.12
  6. Step 6: Final answer
    x = 981.73

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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.