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Finding the Fourth Proportional to 520,211.20, 780,316.80 and 254,490.70

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Solution

The fourth proportional to 520,211.20, 780,316.80 and 254,490.70 is: 381,736.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,211.20 : 780,316.80 = 254,490.70 : x
  2. Step 2: Convert to fraction form
    520,211.20/780,316.80 = 254,490.70/x
  3. Step 3: Cross multiply
    520,211.20x = 780,316.80 × 254,490.70
  4. Step 4: Simplify right side
    520,211.20x = 198,583,368,653.76
  5. Step 5: Solve for x
    x = 198,583,368,653.76/520,211.20
  6. Step 6: Final answer
    x = 381,736.05

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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.