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Finding the Fourth Proportional to 1,240.40, 1,710.24 and 1,092.80

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Solution

The fourth proportional to 1,240.40, 1,710.24 and 1,092.80 is: 1,506.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.40 : 1,710.24 = 1,092.80 : x
  2. Step 2: Convert to fraction form
    1,240.40/1,710.24 = 1,092.80/x
  3. Step 3: Cross multiply
    1,240.40x = 1,710.24 × 1,092.80
  4. Step 4: Simplify right side
    1,240.40x = 1,868,950.27
  5. Step 5: Solve for x
    x = 1,868,950.27/1,240.40
  6. Step 6: Final answer
    x = 1,506.73

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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.