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Finding the Fourth Proportional to 127,990.80, 191,830.48 and 90,561.65

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Solution

The fourth proportional to 127,990.80, 191,830.48 and 90,561.65 is: 135,732.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,990.80 : 191,830.48 = 90,561.65 : x
  2. Step 2: Convert to fraction form
    127,990.80/191,830.48 = 90,561.65/x
  3. Step 3: Cross multiply
    127,990.80x = 191,830.48 × 90,561.65
  4. Step 4: Simplify right side
    127,990.80x = 17,372,483,603.54
  5. Step 5: Solve for x
    x = 17,372,483,603.54/127,990.80
  6. Step 6: Final answer
    x = 135,732.28

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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.