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Finding the Fourth Proportional to 543,886.80, 815,830.20 and 278,166.30

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Solution

The fourth proportional to 543,886.80, 815,830.20 and 278,166.30 is: 417,249.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,886.80 : 815,830.20 = 278,166.30 : x
  2. Step 2: Convert to fraction form
    543,886.80/815,830.20 = 278,166.30/x
  3. Step 3: Cross multiply
    543,886.80x = 815,830.20 × 278,166.30
  4. Step 4: Simplify right side
    543,886.80x = 226,936,468,162.26
  5. Step 5: Solve for x
    x = 226,936,468,162.26/543,886.80
  6. Step 6: Final answer
    x = 417,249.45

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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.