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Finding the Fourth Proportional to 908.55, 1,253.81 and 515.58

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Solution

The fourth proportional to 908.55, 1,253.81 and 515.58 is: 711.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.55 : 1,253.81 = 515.58 : x
  2. Step 2: Convert to fraction form
    908.55/1,253.81 = 515.58/x
  3. Step 3: Cross multiply
    908.55x = 1,253.81 × 515.58
  4. Step 4: Simplify right side
    908.55x = 646,436.78
  5. Step 5: Solve for x
    x = 646,436.78/908.55
  6. Step 6: Final answer
    x = 711.50

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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.