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Finding the Fourth Proportional to 1,246.78, 1,869.82 and 424.88

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Solution

The fourth proportional to 1,246.78, 1,869.82 and 424.88 is: 637.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.78 : 1,869.82 = 424.88 : x
  2. Step 2: Convert to fraction form
    1,246.78/1,869.82 = 424.88/x
  3. Step 3: Cross multiply
    1,246.78x = 1,869.82 × 424.88
  4. Step 4: Simplify right side
    1,246.78x = 794,449.12
  5. Step 5: Solve for x
    x = 794,449.12/1,246.78
  6. Step 6: Final answer
    x = 637.20

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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.