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Finding the Fourth Proportional to 512,145.90, 768,218.85 and 485,901.90

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Solution

The fourth proportional to 512,145.90, 768,218.85 and 485,901.90 is: 728,852.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,145.90 : 768,218.85 = 485,901.90 : x
  2. Step 2: Convert to fraction form
    512,145.90/768,218.85 = 485,901.90/x
  3. Step 3: Cross multiply
    512,145.90x = 768,218.85 × 485,901.90
  4. Step 4: Simplify right side
    512,145.90x = 373,278,998,830.82
  5. Step 5: Solve for x
    x = 373,278,998,830.82/512,145.90
  6. Step 6: Final answer
    x = 728,852.85

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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.