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Finding the Fourth Proportional to 1,240.56, 1,860.70 and 655.33

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Solution

The fourth proportional to 1,240.56, 1,860.70 and 655.33 is: 982.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.56 : 1,860.70 = 655.33 : x
  2. Step 2: Convert to fraction form
    1,240.56/1,860.70 = 655.33/x
  3. Step 3: Cross multiply
    1,240.56x = 1,860.70 × 655.33
  4. Step 4: Simplify right side
    1,240.56x = 1,219,372.53
  5. Step 5: Solve for x
    x = 1,219,372.53/1,240.56
  6. Step 6: Final answer
    x = 982.92

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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.