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Finding the Fourth Proportional to 218,912.60, 328,368.90 and 61,140.80

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Solution

The fourth proportional to 218,912.60, 328,368.90 and 61,140.80 is: 91,711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,912.60 : 328,368.90 = 61,140.80 : x
  2. Step 2: Convert to fraction form
    218,912.60/328,368.90 = 61,140.80/x
  3. Step 3: Cross multiply
    218,912.60x = 328,368.90 × 61,140.80
  4. Step 4: Simplify right side
    218,912.60x = 20,076,737,241.12
  5. Step 5: Solve for x
    x = 20,076,737,241.12/218,912.60
  6. Step 6: Final answer
    x = 91,711.20

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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.