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Finding the Fourth Proportional to 1,006.02, 1,387.26 and 711.18

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Solution

The fourth proportional to 1,006.02, 1,387.26 and 711.18 is: 980.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.02 : 1,387.26 = 711.18 : x
  2. Step 2: Convert to fraction form
    1,006.02/1,387.26 = 711.18/x
  3. Step 3: Cross multiply
    1,006.02x = 1,387.26 × 711.18
  4. Step 4: Simplify right side
    1,006.02x = 986,591.57
  5. Step 5: Solve for x
    x = 986,591.57/1,006.02
  6. Step 6: Final answer
    x = 980.69

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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.