Home / 810,012.20-1,215,018.30-311,376.20

Finding the Fourth Proportional to 810,012.20, 1,215,018.30 and 311,376.20

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Solution

The fourth proportional to 810,012.20, 1,215,018.30 and 311,376.20 is: 467,064.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,012.20 : 1,215,018.30 = 311,376.20 : x
  2. Step 2: Convert to fraction form
    810,012.20/1,215,018.30 = 311,376.20/x
  3. Step 3: Cross multiply
    810,012.20x = 1,215,018.30 × 311,376.20
  4. Step 4: Simplify right side
    810,012.20x = 378,327,781,184.46
  5. Step 5: Solve for x
    x = 378,327,781,184.46/810,012.20
  6. Step 6: Final answer
    x = 467,064.30

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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.