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Finding the Fourth Proportional to 513,211.20, 769,816.80 and 139,234.20

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Solution

The fourth proportional to 513,211.20, 769,816.80 and 139,234.20 is: 208,851.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,211.20 : 769,816.80 = 139,234.20 : x
  2. Step 2: Convert to fraction form
    513,211.20/769,816.80 = 139,234.20/x
  3. Step 3: Cross multiply
    513,211.20x = 769,816.80 × 139,234.20
  4. Step 4: Simplify right side
    513,211.20x = 107,184,826,294.56
  5. Step 5: Solve for x
    x = 107,184,826,294.56/513,211.20
  6. Step 6: Final answer
    x = 208,851.30

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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.