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Finding the Fourth Proportional to 908.12, 1,253.28 and 515.16

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Solution

The fourth proportional to 908.12, 1,253.28 and 515.16 is: 710.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.12 : 1,253.28 = 515.16 : x
  2. Step 2: Convert to fraction form
    908.12/1,253.28 = 515.16/x
  3. Step 3: Cross multiply
    908.12x = 1,253.28 × 515.16
  4. Step 4: Simplify right side
    908.12x = 645,639.72
  5. Step 5: Solve for x
    x = 645,639.72/908.12
  6. Step 6: Final answer
    x = 710.96

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1.5x scale

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.