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Finding the Fourth Proportional to 908.18, 1,253.18 and 515.20

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Solution

The fourth proportional to 908.18, 1,253.18 and 515.20 is: 710.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.18 : 1,253.18 = 515.20 : x
  2. Step 2: Convert to fraction form
    908.18/1,253.18 = 515.20/x
  3. Step 3: Cross multiply
    908.18x = 1,253.18 × 515.20
  4. Step 4: Simplify right side
    908.18x = 645,636.49
  5. Step 5: Solve for x
    x = 645,636.49/908.18
  6. Step 6: Final answer
    x = 710.91

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Double scale
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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.