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Finding the Fourth Proportional to 83,919.40, 125,879.10 and 28,515.40

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Solution

The fourth proportional to 83,919.40, 125,879.10 and 28,515.40 is: 42,773.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,919.40 : 125,879.10 = 28,515.40 : x
  2. Step 2: Convert to fraction form
    83,919.40/125,879.10 = 28,515.40/x
  3. Step 3: Cross multiply
    83,919.40x = 125,879.10 × 28,515.40
  4. Step 4: Simplify right side
    83,919.40x = 3,589,492,888.14
  5. Step 5: Solve for x
    x = 3,589,492,888.14/83,919.40
  6. Step 6: Final answer
    x = 42,773.10

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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.