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Finding the Fourth Proportional to 1,240.79, 1,861.31 and 461.03

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Solution

The fourth proportional to 1,240.79, 1,861.31 and 461.03 is: 691.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.79 : 1,861.31 = 461.03 : x
  2. Step 2: Convert to fraction form
    1,240.79/1,861.31 = 461.03/x
  3. Step 3: Cross multiply
    1,240.79x = 1,861.31 × 461.03
  4. Step 4: Simplify right side
    1,240.79x = 858,111.60
  5. Step 5: Solve for x
    x = 858,111.60/1,240.79
  6. Step 6: Final answer
    x = 691.59

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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.