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Finding the Fourth Proportional to 908.21, 1,253.70 and 613.88

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Solution

The fourth proportional to 908.21, 1,253.70 and 613.88 is: 847.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.21 : 1,253.70 = 613.88 : x
  2. Step 2: Convert to fraction form
    908.21/1,253.70 = 613.88/x
  3. Step 3: Cross multiply
    908.21x = 1,253.70 × 613.88
  4. Step 4: Simplify right side
    908.21x = 769,615.09
  5. Step 5: Solve for x
    x = 769,615.09/908.21
  6. Step 6: Final answer
    x = 847.40

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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.