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Finding the Fourth Proportional to 438.60, 605.05 and 291.05

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Solution

The fourth proportional to 438.60, 605.05 and 291.05 is: 401.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.60 : 605.05 = 291.05 : x
  2. Step 2: Convert to fraction form
    438.60/605.05 = 291.05/x
  3. Step 3: Cross multiply
    438.60x = 605.05 × 291.05
  4. Step 4: Simplify right side
    438.60x = 176,096.78
  5. Step 5: Solve for x
    x = 176,096.78/438.60
  6. Step 6: Final answer
    x = 401.50

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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.