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Finding the Fourth Proportional to 319,611.20, 479,084.70 and 129,990.20

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Solution

The fourth proportional to 319,611.20, 479,084.70 and 129,990.20 is: 194,850.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,611.20 : 479,084.70 = 129,990.20 : x
  2. Step 2: Convert to fraction form
    319,611.20/479,084.70 = 129,990.20/x
  3. Step 3: Cross multiply
    319,611.20x = 479,084.70 × 129,990.20
  4. Step 4: Simplify right side
    319,611.20x = 62,276,315,969.94
  5. Step 5: Solve for x
    x = 62,276,315,969.94/319,611.20
  6. Step 6: Final answer
    x = 194,850.23

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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.