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Finding the Fourth Proportional to 1,240.98, 1,708.26 and 990.42

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Solution

The fourth proportional to 1,240.98, 1,708.26 and 990.42 is: 1,363.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.98 : 1,708.26 = 990.42 : x
  2. Step 2: Convert to fraction form
    1,240.98/1,708.26 = 990.42/x
  3. Step 3: Cross multiply
    1,240.98x = 1,708.26 × 990.42
  4. Step 4: Simplify right side
    1,240.98x = 1,691,894.87
  5. Step 5: Solve for x
    x = 1,691,894.87/1,240.98
  6. Step 6: Final answer
    x = 1,363.35

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1.5x scale

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.