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Finding the Fourth Proportional to 520,211.70, 780,317.55 and 254,491.20

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Solution

The fourth proportional to 520,211.70, 780,317.55 and 254,491.20 is: 381,736.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,211.70 : 780,317.55 = 254,491.20 : x
  2. Step 2: Convert to fraction form
    520,211.70/780,317.55 = 254,491.20/x
  3. Step 3: Cross multiply
    520,211.70x = 780,317.55 × 254,491.20
  4. Step 4: Simplify right side
    520,211.70x = 198,583,949,680.56
  5. Step 5: Solve for x
    x = 198,583,949,680.56/520,211.70
  6. Step 6: Final answer
    x = 381,736.80

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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.