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Finding the Fourth Proportional to 908.21, 1,253.45 and 515.25

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Solution

The fourth proportional to 908.21, 1,253.45 and 515.25 is: 711.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.21 : 1,253.45 = 515.25 : x
  2. Step 2: Convert to fraction form
    908.21/1,253.45 = 515.25/x
  3. Step 3: Cross multiply
    908.21x = 1,253.45 × 515.25
  4. Step 4: Simplify right side
    908.21x = 645,841.40
  5. Step 5: Solve for x
    x = 645,841.40/908.21
  6. Step 6: Final answer
    x = 711.11

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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.