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Finding the Fourth Proportional to 850.38, 1,275.92 and 459.92

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Solution

The fourth proportional to 850.38, 1,275.92 and 459.92 is: 690.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.38 : 1,275.92 = 459.92 : x
  2. Step 2: Convert to fraction form
    850.38/1,275.92 = 459.92/x
  3. Step 3: Cross multiply
    850.38x = 1,275.92 × 459.92
  4. Step 4: Simplify right side
    850.38x = 586,821.13
  5. Step 5: Solve for x
    x = 586,821.13/850.38
  6. Step 6: Final answer
    x = 690.07

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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.