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Finding the Fourth Proportional to 908.30, 1,253.26 and 535.15

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Solution

The fourth proportional to 908.30, 1,253.26 and 535.15 is: 738.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.30 : 1,253.26 = 535.15 : x
  2. Step 2: Convert to fraction form
    908.30/1,253.26 = 535.15/x
  3. Step 3: Cross multiply
    908.30x = 1,253.26 × 535.15
  4. Step 4: Simplify right side
    908.30x = 670,677.16
  5. Step 5: Solve for x
    x = 670,677.16/908.30
  6. Step 6: Final answer
    x = 738.39

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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.