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Finding the Fourth Proportional to 908.61, 1,253.86 and 515.76

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Solution

The fourth proportional to 908.61, 1,253.86 and 515.76 is: 711.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.61 : 1,253.86 = 515.76 : x
  2. Step 2: Convert to fraction form
    908.61/1,253.86 = 515.76/x
  3. Step 3: Cross multiply
    908.61x = 1,253.86 × 515.76
  4. Step 4: Simplify right side
    908.61x = 646,690.83
  5. Step 5: Solve for x
    x = 646,690.83/908.61
  6. Step 6: Final answer
    x = 711.74

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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.