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Finding the Fourth Proportional to 81,968.80, 123,068.40 and 64,458.40

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Solution

The fourth proportional to 81,968.80, 123,068.40 and 64,458.40 is: 96,778.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,968.80 : 123,068.40 = 64,458.40 : x
  2. Step 2: Convert to fraction form
    81,968.80/123,068.40 = 64,458.40/x
  3. Step 3: Cross multiply
    81,968.80x = 123,068.40 × 64,458.40
  4. Step 4: Simplify right side
    81,968.80x = 7,932,792,154.56
  5. Step 5: Solve for x
    x = 7,932,792,154.56/81,968.80
  6. Step 6: Final answer
    x = 96,778.19

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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.