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Finding the Fourth Proportional to 508,721.20, 763,081.80 and 479,690.80

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Solution

The fourth proportional to 508,721.20, 763,081.80 and 479,690.80 is: 719,536.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,721.20 : 763,081.80 = 479,690.80 : x
  2. Step 2: Convert to fraction form
    508,721.20/763,081.80 = 479,690.80/x
  3. Step 3: Cross multiply
    508,721.20x = 763,081.80 × 479,690.80
  4. Step 4: Simplify right side
    508,721.20x = 366,043,319,107.44
  5. Step 5: Solve for x
    x = 366,043,319,107.44/508,721.20
  6. Step 6: Final answer
    x = 719,536.20

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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.