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Finding the Fourth Proportional to 218,816.80, 328,220.40 and 61,040.80

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Solution

The fourth proportional to 218,816.80, 328,220.40 and 61,040.80 is: 91,559.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,816.80 : 328,220.40 = 61,040.80 : x
  2. Step 2: Convert to fraction form
    218,816.80/328,220.40 = 61,040.80/x
  3. Step 3: Cross multiply
    218,816.80x = 328,220.40 × 61,040.80
  4. Step 4: Simplify right side
    218,816.80x = 20,034,835,792.32
  5. Step 5: Solve for x
    x = 20,034,835,792.32/218,816.80
  6. Step 6: Final answer
    x = 91,559.86

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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.