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Finding the Fourth Proportional to 908.19, 1,253.30 and 515.24

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Solution

The fourth proportional to 908.19, 1,253.30 and 515.24 is: 711.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.19 : 1,253.30 = 515.24 : x
  2. Step 2: Convert to fraction form
    908.19/1,253.30 = 515.24/x
  3. Step 3: Cross multiply
    908.19x = 1,253.30 × 515.24
  4. Step 4: Simplify right side
    908.19x = 645,750.29
  5. Step 5: Solve for x
    x = 645,750.29/908.19
  6. Step 6: Final answer
    x = 711.03

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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.