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Finding the Fourth Proportional to 319,611.20, 479,589.60 and 142,145.60

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Solution

The fourth proportional to 319,611.20, 479,589.60 and 142,145.60 is: 213,295.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,611.20 : 479,589.60 = 142,145.60 : x
  2. Step 2: Convert to fraction form
    319,611.20/479,589.60 = 142,145.60/x
  3. Step 3: Cross multiply
    319,611.20x = 479,589.60 × 142,145.60
  4. Step 4: Simplify right side
    319,611.20x = 68,171,551,445.76
  5. Step 5: Solve for x
    x = 68,171,551,445.76/319,611.20
  6. Step 6: Final answer
    x = 213,295.25

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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.