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Finding the Fourth Proportional to 219,376.80, 328,919.40 and 100,987.20

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Solution

The fourth proportional to 219,376.80, 328,919.40 and 100,987.20 is: 151,413.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,376.80 : 328,919.40 = 100,987.20 : x
  2. Step 2: Convert to fraction form
    219,376.80/328,919.40 = 100,987.20/x
  3. Step 3: Cross multiply
    219,376.80x = 328,919.40 × 100,987.20
  4. Step 4: Simplify right side
    219,376.80x = 33,216,649,231.68
  5. Step 5: Solve for x
    x = 33,216,649,231.68/219,376.80
  6. Step 6: Final answer
    x = 151,413.68

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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.