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Finding the Fourth Proportional to 510,120.60, 765,180.90 and 431,388.60

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Solution

The fourth proportional to 510,120.60, 765,180.90 and 431,388.60 is: 647,082.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    510,120.60 : 765,180.90 = 431,388.60 : x
  2. Step 2: Convert to fraction form
    510,120.60/765,180.90 = 431,388.60/x
  3. Step 3: Cross multiply
    510,120.60x = 765,180.90 × 431,388.60
  4. Step 4: Simplify right side
    510,120.60x = 330,090,317,197.74
  5. Step 5: Solve for x
    x = 330,090,317,197.74/510,120.60
  6. Step 6: Final answer
    x = 647,082.90

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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.