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Finding the Fourth Proportional to 1,240.90, 1,858.11 and 660.94

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Solution

The fourth proportional to 1,240.90, 1,858.11 and 660.94 is: 989.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.90 : 1,858.11 = 660.94 : x
  2. Step 2: Convert to fraction form
    1,240.90/1,858.11 = 660.94/x
  3. Step 3: Cross multiply
    1,240.90x = 1,858.11 × 660.94
  4. Step 4: Simplify right side
    1,240.90x = 1,228,099.22
  5. Step 5: Solve for x
    x = 1,228,099.22/1,240.90
  6. Step 6: Final answer
    x = 989.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.