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Finding the Fourth Proportional to 1,240.65, 1,860.89 and 418.95

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Solution

The fourth proportional to 1,240.65, 1,860.89 and 418.95 is: 628.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.65 : 1,860.89 = 418.95 : x
  2. Step 2: Convert to fraction form
    1,240.65/1,860.89 = 418.95/x
  3. Step 3: Cross multiply
    1,240.65x = 1,860.89 × 418.95
  4. Step 4: Simplify right side
    1,240.65x = 779,617.77
  5. Step 5: Solve for x
    x = 779,617.77/1,240.65
  6. Step 6: Final answer
    x = 628.39

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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.