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Finding the Fourth Proportional to 98,940.80, 136,538 and 53,620.08

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Solution

The fourth proportional to 98,940.80, 136,538 and 53,620.08 is: 73,995.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,940.80 : 136,538 = 53,620.08 : x
  2. Step 2: Convert to fraction form
    98,940.80/136,538 = 53,620.08/x
  3. Step 3: Cross multiply
    98,940.80x = 136,538 × 53,620.08
  4. Step 4: Simplify right side
    98,940.80x = 7,321,178,483.04
  5. Step 5: Solve for x
    x = 7,321,178,483.04/98,940.80
  6. Step 6: Final answer
    x = 73,995.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.