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Finding the Fourth Proportional to 1,245.85, 1,868.56 and 424.13

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Solution

The fourth proportional to 1,245.85, 1,868.56 and 424.13 is: 636.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.85 : 1,868.56 = 424.13 : x
  2. Step 2: Convert to fraction form
    1,245.85/1,868.56 = 424.13/x
  3. Step 3: Cross multiply
    1,245.85x = 1,868.56 × 424.13
  4. Step 4: Simplify right side
    1,245.85x = 792,501.95
  5. Step 5: Solve for x
    x = 792,501.95/1,245.85
  6. Step 6: Final answer
    x = 636.11

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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.