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Finding the Fourth Proportional to 543,856.80, 815,785.20 and 278,136.30

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Solution

The fourth proportional to 543,856.80, 815,785.20 and 278,136.30 is: 417,204.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,856.80 : 815,785.20 = 278,136.30 : x
  2. Step 2: Convert to fraction form
    543,856.80/815,785.20 = 278,136.30/x
  3. Step 3: Cross multiply
    543,856.80x = 815,785.20 × 278,136.30
  4. Step 4: Simplify right side
    543,856.80x = 226,899,477,122.76
  5. Step 5: Solve for x
    x = 226,899,477,122.76/543,856.80
  6. Step 6: Final answer
    x = 417,204.45

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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.