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Finding the Fourth Proportional to 218,856.80, 328,280.40 and 61,080.80

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Solution

The fourth proportional to 218,856.80, 328,280.40 and 61,080.80 is: 91,619.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,856.80 : 328,280.40 = 61,080.80 : x
  2. Step 2: Convert to fraction form
    218,856.80/328,280.40 = 61,080.80/x
  3. Step 3: Cross multiply
    218,856.80x = 328,280.40 × 61,080.80
  4. Step 4: Simplify right side
    218,856.80x = 20,051,629,456.32
  5. Step 5: Solve for x
    x = 20,051,629,456.32/218,856.80
  6. Step 6: Final answer
    x = 91,619.86

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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.