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Finding the Fourth Proportional to 121,271.70, 181,907.55 and 91,747.20

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Solution

The fourth proportional to 121,271.70, 181,907.55 and 91,747.20 is: 137,620.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,271.70 : 181,907.55 = 91,747.20 : x
  2. Step 2: Convert to fraction form
    121,271.70/181,907.55 = 91,747.20/x
  3. Step 3: Cross multiply
    121,271.70x = 181,907.55 × 91,747.20
  4. Step 4: Simplify right side
    121,271.70x = 16,689,508,371.36
  5. Step 5: Solve for x
    x = 16,689,508,371.36/121,271.70
  6. Step 6: Final answer
    x = 137,620.80

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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.