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Finding the Fourth Proportional to 91,880.80, 137,821.20 and 91,297.60

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Solution

The fourth proportional to 91,880.80, 137,821.20 and 91,297.60 is: 136,946.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,880.80 : 137,821.20 = 91,297.60 : x
  2. Step 2: Convert to fraction form
    91,880.80/137,821.20 = 91,297.60/x
  3. Step 3: Cross multiply
    91,880.80x = 137,821.20 × 91,297.60
  4. Step 4: Simplify right side
    91,880.80x = 12,582,744,789.12
  5. Step 5: Solve for x
    x = 12,582,744,789.12/91,880.80
  6. Step 6: Final answer
    x = 136,946.40

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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.