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Finding the Fourth Proportional to 1,229.38, 1,842.85 and 578.95

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Solution

The fourth proportional to 1,229.38, 1,842.85 and 578.95 is: 867.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.38 : 1,842.85 = 578.95 : x
  2. Step 2: Convert to fraction form
    1,229.38/1,842.85 = 578.95/x
  3. Step 3: Cross multiply
    1,229.38x = 1,842.85 × 578.95
  4. Step 4: Simplify right side
    1,229.38x = 1,066,918.01
  5. Step 5: Solve for x
    x = 1,066,918.01/1,229.38
  6. Step 6: Final answer
    x = 867.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.