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Finding the Fourth Proportional to 319,480.60, 479,220.90 and 82,821.40

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Solution

The fourth proportional to 319,480.60, 479,220.90 and 82,821.40 is: 124,232.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,480.60 : 479,220.90 = 82,821.40 : x
  2. Step 2: Convert to fraction form
    319,480.60/479,220.90 = 82,821.40/x
  3. Step 3: Cross multiply
    319,480.60x = 479,220.90 × 82,821.40
  4. Step 4: Simplify right side
    319,480.60x = 39,689,745,847.26
  5. Step 5: Solve for x
    x = 39,689,745,847.26/319,480.60
  6. Step 6: Final answer
    x = 124,232.10

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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.