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Finding the Fourth Proportional to 901.10, 1,245.20 and 679.65

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Solution

The fourth proportional to 901.10, 1,245.20 and 679.65 is: 939.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.10 : 1,245.20 = 679.65 : x
  2. Step 2: Convert to fraction form
    901.10/1,245.20 = 679.65/x
  3. Step 3: Cross multiply
    901.10x = 1,245.20 × 679.65
  4. Step 4: Simplify right side
    901.10x = 846,296.78
  5. Step 5: Solve for x
    x = 846,296.78/901.10
  6. Step 6: Final answer
    x = 939.19

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.