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Finding the Fourth Proportional to 1,065.57, 1,471 and 711.70

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Solution

The fourth proportional to 1,065.57, 1,471 and 711.70 is: 982.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.57 : 1,471 = 711.70 : x
  2. Step 2: Convert to fraction form
    1,065.57/1,471 = 711.70/x
  3. Step 3: Cross multiply
    1,065.57x = 1,471 × 711.70
  4. Step 4: Simplify right side
    1,065.57x = 1,046,910.70
  5. Step 5: Solve for x
    x = 1,046,910.70/1,065.57
  6. Step 6: Final answer
    x = 982.49

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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.