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Finding the Fourth Proportional to 1,358.75, 2,037.38 and 421.44

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Solution

The fourth proportional to 1,358.75, 2,037.38 and 421.44 is: 631.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.75 : 2,037.38 = 421.44 : x
  2. Step 2: Convert to fraction form
    1,358.75/2,037.38 = 421.44/x
  3. Step 3: Cross multiply
    1,358.75x = 2,037.38 × 421.44
  4. Step 4: Simplify right side
    1,358.75x = 858,633.09
  5. Step 5: Solve for x
    x = 858,633.09/1,358.75
  6. Step 6: Final answer
    x = 631.93

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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.