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Finding the Fourth Proportional to 908.18, 1,253.30 and 515.34

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Solution

The fourth proportional to 908.18, 1,253.30 and 515.34 is: 711.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.18 : 1,253.30 = 515.34 : x
  2. Step 2: Convert to fraction form
    908.18/1,253.30 = 515.34/x
  3. Step 3: Cross multiply
    908.18x = 1,253.30 × 515.34
  4. Step 4: Simplify right side
    908.18x = 645,875.62
  5. Step 5: Solve for x
    x = 645,875.62/908.18
  6. Step 6: Final answer
    x = 711.18

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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.