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Finding the Fourth Proportional to 319,202.20, 478,220.10 and 259,715.80

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Solution

The fourth proportional to 319,202.20, 478,220.10 and 259,715.80 is: 389,099.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,202.20 : 478,220.10 = 259,715.80 : x
  2. Step 2: Convert to fraction form
    319,202.20/478,220.10 = 259,715.80/x
  3. Step 3: Cross multiply
    319,202.20x = 478,220.10 × 259,715.80
  4. Step 4: Simplify right side
    319,202.20x = 124,201,315,847.58
  5. Step 5: Solve for x
    x = 124,201,315,847.58/319,202.20
  6. Step 6: Final answer
    x = 389,099.18

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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.