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Finding the Fourth Proportional to 1,242.10, 1,863.35 and 408.93

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Solution

The fourth proportional to 1,242.10, 1,863.35 and 408.93 is: 613.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.10 : 1,863.35 = 408.93 : x
  2. Step 2: Convert to fraction form
    1,242.10/1,863.35 = 408.93/x
  3. Step 3: Cross multiply
    1,242.10x = 1,863.35 × 408.93
  4. Step 4: Simplify right side
    1,242.10x = 761,977.67
  5. Step 5: Solve for x
    x = 761,977.67/1,242.10
  6. Step 6: Final answer
    x = 613.46

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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.