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Finding the Fourth Proportional to 1,240.83, 1,860.84 and 418.95

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Solution

The fourth proportional to 1,240.83, 1,860.84 and 418.95 is: 628.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.83 : 1,860.84 = 418.95 : x
  2. Step 2: Convert to fraction form
    1,240.83/1,860.84 = 418.95/x
  3. Step 3: Cross multiply
    1,240.83x = 1,860.84 × 418.95
  4. Step 4: Simplify right side
    1,240.83x = 779,598.92
  5. Step 5: Solve for x
    x = 779,598.92/1,240.83
  6. Step 6: Final answer
    x = 628.29

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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.