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Finding the Fourth Proportional to 306.83, 423.90 and 291.84

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Solution

The fourth proportional to 306.83, 423.90 and 291.84 is: 403.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.83 : 423.90 = 291.84 : x
  2. Step 2: Convert to fraction form
    306.83/423.90 = 291.84/x
  3. Step 3: Cross multiply
    306.83x = 423.90 × 291.84
  4. Step 4: Simplify right side
    306.83x = 123,710.98
  5. Step 5: Solve for x
    x = 123,710.98/306.83
  6. Step 6: Final answer
    x = 403.20

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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.