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Finding the Fourth Proportional to 908.46, 1,253.69 and 515.54

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Solution

The fourth proportional to 908.46, 1,253.69 and 515.54 is: 711.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.46 : 1,253.69 = 515.54 : x
  2. Step 2: Convert to fraction form
    908.46/1,253.69 = 515.54/x
  3. Step 3: Cross multiply
    908.46x = 1,253.69 × 515.54
  4. Step 4: Simplify right side
    908.46x = 646,327.34
  5. Step 5: Solve for x
    x = 646,327.34/908.46
  6. Step 6: Final answer
    x = 711.45

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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.