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Finding the Fourth Proportional to 55,479.66, 83,219.49 and 47,139.90

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Solution

The fourth proportional to 55,479.66, 83,219.49 and 47,139.90 is: 70,709.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,479.66 : 83,219.49 = 47,139.90 : x
  2. Step 2: Convert to fraction form
    55,479.66/83,219.49 = 47,139.90/x
  3. Step 3: Cross multiply
    55,479.66x = 83,219.49 × 47,139.90
  4. Step 4: Simplify right side
    55,479.66x = 3,922,958,436.65
  5. Step 5: Solve for x
    x = 3,922,958,436.65/55,479.66
  6. Step 6: Final answer
    x = 70,709.85

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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.