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Finding the Fourth Proportional to 438.10, 656.67 and 284.34

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Solution

The fourth proportional to 438.10, 656.67 and 284.34 is: 426.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.10 : 656.67 = 284.34 : x
  2. Step 2: Convert to fraction form
    438.10/656.67 = 284.34/x
  3. Step 3: Cross multiply
    438.10x = 656.67 × 284.34
  4. Step 4: Simplify right side
    438.10x = 186,717.55
  5. Step 5: Solve for x
    x = 186,717.55/438.10
  6. Step 6: Final answer
    x = 426.20

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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.