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Finding the Fourth Proportional to 1,242.58, 1,863.75 and 420.83

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Solution

The fourth proportional to 1,242.58, 1,863.75 and 420.83 is: 631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.58 : 1,863.75 = 420.83 : x
  2. Step 2: Convert to fraction form
    1,242.58/1,863.75 = 420.83/x
  3. Step 3: Cross multiply
    1,242.58x = 1,863.75 × 420.83
  4. Step 4: Simplify right side
    1,242.58x = 784,321.91
  5. Step 5: Solve for x
    x = 784,321.91/1,242.58
  6. Step 6: Final answer
    x = 631.20

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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.