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Finding the Fourth Proportional to 1,425.65, 2,138.78 and 438.55

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Solution

The fourth proportional to 1,425.65, 2,138.78 and 438.55 is: 657.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.65 : 2,138.78 = 438.55 : x
  2. Step 2: Convert to fraction form
    1,425.65/2,138.78 = 438.55/x
  3. Step 3: Cross multiply
    1,425.65x = 2,138.78 × 438.55
  4. Step 4: Simplify right side
    1,425.65x = 937,957.72
  5. Step 5: Solve for x
    x = 937,957.72/1,425.65
  6. Step 6: Final answer
    x = 657.92

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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.