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Finding the Fourth Proportional to 438.47, 657.48 and 255.90

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Solution

The fourth proportional to 438.47, 657.48 and 255.90 is: 383.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.47 : 657.48 = 255.90 : x
  2. Step 2: Convert to fraction form
    438.47/657.48 = 255.90/x
  3. Step 3: Cross multiply
    438.47x = 657.48 × 255.90
  4. Step 4: Simplify right side
    438.47x = 168,249.13
  5. Step 5: Solve for x
    x = 168,249.13/438.47
  6. Step 6: Final answer
    x = 383.72

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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.