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Finding the Fourth Proportional to 902.75, 1,245.80 and 488.75

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Solution

The fourth proportional to 902.75, 1,245.80 and 488.75 is: 674.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.75 : 1,245.80 = 488.75 : x
  2. Step 2: Convert to fraction form
    902.75/1,245.80 = 488.75/x
  3. Step 3: Cross multiply
    902.75x = 1,245.80 × 488.75
  4. Step 4: Simplify right side
    902.75x = 608,882.31
  5. Step 5: Solve for x
    x = 608,882.31/902.75
  6. Step 6: Final answer
    x = 674.48

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.