Home / 1,331.20-1,996.80-509.05

Finding the Fourth Proportional to 1,331.20, 1,996.80 and 509.05

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Solution

The fourth proportional to 1,331.20, 1,996.80 and 509.05 is: 763.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.20 : 1,996.80 = 509.05 : x
  2. Step 2: Convert to fraction form
    1,331.20/1,996.80 = 509.05/x
  3. Step 3: Cross multiply
    1,331.20x = 1,996.80 × 509.05
  4. Step 4: Simplify right side
    1,331.20x = 1,016,471.04
  5. Step 5: Solve for x
    x = 1,016,471.04/1,331.20
  6. Step 6: Final answer
    x = 763.58

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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.