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Finding the Fourth Proportional to 61,270.65, 91,919.07 and 21,290.90

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Solution

The fourth proportional to 61,270.65, 91,919.07 and 21,290.90 is: 31,940.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,270.65 : 91,919.07 = 21,290.90 : x
  2. Step 2: Convert to fraction form
    61,270.65/91,919.07 = 21,290.90/x
  3. Step 3: Cross multiply
    61,270.65x = 91,919.07 × 21,290.90
  4. Step 4: Simplify right side
    61,270.65x = 1,957,039,267.87
  5. Step 5: Solve for x
    x = 1,957,039,267.87/61,270.65
  6. Step 6: Final answer
    x = 31,940.89

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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.