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Finding the Fourth Proportional to 439.30, 605.47 and 291.67

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Solution

The fourth proportional to 439.30, 605.47 and 291.67 is: 402.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.30 : 605.47 = 291.67 : x
  2. Step 2: Convert to fraction form
    439.30/605.47 = 291.67/x
  3. Step 3: Cross multiply
    439.30x = 605.47 × 291.67
  4. Step 4: Simplify right side
    439.30x = 176,597.43
  5. Step 5: Solve for x
    x = 176,597.43/439.30
  6. Step 6: Final answer
    x = 402.00

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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.