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Finding the Fourth Proportional to 306.91, 423.45 and 291.52

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Solution

The fourth proportional to 306.91, 423.45 and 291.52 is: 402.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.91 : 423.45 = 291.52 : x
  2. Step 2: Convert to fraction form
    306.91/423.45 = 291.52/x
  3. Step 3: Cross multiply
    306.91x = 423.45 × 291.52
  4. Step 4: Simplify right side
    306.91x = 123,444.14
  5. Step 5: Solve for x
    x = 123,444.14/306.91
  6. Step 6: Final answer
    x = 402.22

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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.