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Finding the Fourth Proportional to 908.60, 1,253.91 and 515.75

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Solution

The fourth proportional to 908.60, 1,253.91 and 515.75 is: 711.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.60 : 1,253.91 = 515.75 : x
  2. Step 2: Convert to fraction form
    908.60/1,253.91 = 515.75/x
  3. Step 3: Cross multiply
    908.60x = 1,253.91 × 515.75
  4. Step 4: Simplify right side
    908.60x = 646,697.81
  5. Step 5: Solve for x
    x = 646,697.81/908.60
  6. Step 6: Final answer
    x = 711.76

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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.