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Finding the Fourth Proportional to 309,879.60, 464,819.40 and 215,401.20

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Solution

The fourth proportional to 309,879.60, 464,819.40 and 215,401.20 is: 323,101.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,879.60 : 464,819.40 = 215,401.20 : x
  2. Step 2: Convert to fraction form
    309,879.60/464,819.40 = 215,401.20/x
  3. Step 3: Cross multiply
    309,879.60x = 464,819.40 × 215,401.20
  4. Step 4: Simplify right side
    309,879.60x = 100,122,656,543.28
  5. Step 5: Solve for x
    x = 100,122,656,543.28/309,879.60
  6. Step 6: Final answer
    x = 323,101.80

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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.