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Finding the Fourth Proportional to 908.63, 1,253.87 and 515.65

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Solution

The fourth proportional to 908.63, 1,253.87 and 515.65 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.63 : 1,253.87 = 515.65 : x
  2. Step 2: Convert to fraction form
    908.63/1,253.87 = 515.65/x
  3. Step 3: Cross multiply
    908.63x = 1,253.87 × 515.65
  4. Step 4: Simplify right side
    908.63x = 646,551.80
  5. Step 5: Solve for x
    x = 646,551.80/908.63
  6. Step 6: Final answer
    x = 711.57

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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.