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Finding the Fourth Proportional to 1,240.79, 1,860.83 and 418.88

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Solution

The fourth proportional to 1,240.79, 1,860.83 and 418.88 is: 628.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.79 : 1,860.83 = 418.88 : x
  2. Step 2: Convert to fraction form
    1,240.79/1,860.83 = 418.88/x
  3. Step 3: Cross multiply
    1,240.79x = 1,860.83 × 418.88
  4. Step 4: Simplify right side
    1,240.79x = 779,453.07
  5. Step 5: Solve for x
    x = 779,453.07/1,240.79
  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.