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Finding the Fourth Proportional to 438.88, 658.43 and 256.40

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Solution

The fourth proportional to 438.88, 658.43 and 256.40 is: 384.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.88 : 658.43 = 256.40 : x
  2. Step 2: Convert to fraction form
    438.88/658.43 = 256.40/x
  3. Step 3: Cross multiply
    438.88x = 658.43 × 256.40
  4. Step 4: Simplify right side
    438.88x = 168,820.31
  5. Step 5: Solve for x
    x = 168,820.31/438.88
  6. Step 6: Final answer
    x = 384.66

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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.