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Finding the Fourth Proportional to 438.56, 604.84 and 291.40

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Solution

The fourth proportional to 438.56, 604.84 and 291.40 is: 401.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.56 : 604.84 = 291.40 : x
  2. Step 2: Convert to fraction form
    438.56/604.84 = 291.40/x
  3. Step 3: Cross multiply
    438.56x = 604.84 × 291.40
  4. Step 4: Simplify right side
    438.56x = 176,250.38
  5. Step 5: Solve for x
    x = 176,250.38/438.56
  6. Step 6: Final answer
    x = 401.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.