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Finding the Fourth Proportional to 19,896.57, 29,839.38 and 7,421.55

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Solution

The fourth proportional to 19,896.57, 29,839.38 and 7,421.55 is: 11,130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,896.57 : 29,839.38 = 7,421.55 : x
  2. Step 2: Convert to fraction form
    19,896.57/29,839.38 = 7,421.55/x
  3. Step 3: Cross multiply
    19,896.57x = 29,839.38 × 7,421.55
  4. Step 4: Simplify right side
    19,896.57x = 221,454,450.64
  5. Step 5: Solve for x
    x = 221,454,450.64/19,896.57
  6. Step 6: Final answer
    x = 11,130.28

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1.5x scale

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.