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Finding the Fourth Proportional to 513,902.80, 770,854.20 and 419,424.40

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Solution

The fourth proportional to 513,902.80, 770,854.20 and 419,424.40 is: 629,136.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,902.80 : 770,854.20 = 419,424.40 : x
  2. Step 2: Convert to fraction form
    513,902.80/770,854.20 = 419,424.40/x
  3. Step 3: Cross multiply
    513,902.80x = 770,854.20 × 419,424.40
  4. Step 4: Simplify right side
    513,902.80x = 323,315,060,322.48
  5. Step 5: Solve for x
    x = 323,315,060,322.48/513,902.80
  6. Step 6: Final answer
    x = 629,136.60

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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.