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Finding the Fourth Proportional to 438.72, 605.23 and 291.45

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Solution

The fourth proportional to 438.72, 605.23 and 291.45 is: 402.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.72 : 605.23 = 291.45 : x
  2. Step 2: Convert to fraction form
    438.72/605.23 = 291.45/x
  3. Step 3: Cross multiply
    438.72x = 605.23 × 291.45
  4. Step 4: Simplify right side
    438.72x = 176,394.28
  5. Step 5: Solve for x
    x = 176,394.28/438.72
  6. Step 6: Final answer
    x = 402.07

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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.