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Finding the Fourth Proportional to 61,271.65, 91,920.57 and 21,291.90

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Solution

The fourth proportional to 61,271.65, 91,920.57 and 21,291.90 is: 31,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,271.65 : 91,920.57 = 21,291.90 : x
  2. Step 2: Convert to fraction form
    61,271.65/91,920.57 = 21,291.90/x
  3. Step 3: Cross multiply
    61,271.65x = 91,920.57 × 21,291.90
  4. Step 4: Simplify right side
    61,271.65x = 1,957,163,584.38
  5. Step 5: Solve for x
    x = 1,957,163,584.38/61,271.65
  6. Step 6: Final answer
    x = 31,942.40

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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.