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Finding the Fourth Proportional to 1,240.52, 1,860.78 and 418.79

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Solution

The fourth proportional to 1,240.52, 1,860.78 and 418.79 is: 628.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.52 : 1,860.78 = 418.79 : x
  2. Step 2: Convert to fraction form
    1,240.52/1,860.78 = 418.79/x
  3. Step 3: Cross multiply
    1,240.52x = 1,860.78 × 418.79
  4. Step 4: Simplify right side
    1,240.52x = 779,279.92
  5. Step 5: Solve for x
    x = 779,279.92/1,240.52
  6. Step 6: Final answer
    x = 628.19

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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.