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Finding the Fourth Proportional to 1,022.70, 1,542.04 and 986.70

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Solution

The fourth proportional to 1,022.70, 1,542.04 and 986.70 is: 1,487.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022.70 : 1,542.04 = 986.70 : x
  2. Step 2: Convert to fraction form
    1,022.70/1,542.04 = 986.70/x
  3. Step 3: Cross multiply
    1,022.70x = 1,542.04 × 986.70
  4. Step 4: Simplify right side
    1,022.70x = 1,521,530.87
  5. Step 5: Solve for x
    x = 1,521,530.87/1,022.70
  6. Step 6: Final answer
    x = 1,487.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.