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Finding the Fourth Proportional to 455,959.80, 683,939.70 and 287,998.20

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Solution

The fourth proportional to 455,959.80, 683,939.70 and 287,998.20 is: 431,997.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,959.80 : 683,939.70 = 287,998.20 : x
  2. Step 2: Convert to fraction form
    455,959.80/683,939.70 = 287,998.20/x
  3. Step 3: Cross multiply
    455,959.80x = 683,939.70 × 287,998.20
  4. Step 4: Simplify right side
    455,959.80x = 196,973,402,508.54
  5. Step 5: Solve for x
    x = 196,973,402,508.54/455,959.80
  6. Step 6: Final answer
    x = 431,997.30

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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.