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Finding the Fourth Proportional to 19,991.50, 29,987.97 and 7,510.21

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Solution

The fourth proportional to 19,991.50, 29,987.97 and 7,510.21 is: 11,265.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.50 : 29,987.97 = 7,510.21 : x
  2. Step 2: Convert to fraction form
    19,991.50/29,987.97 = 7,510.21/x
  3. Step 3: Cross multiply
    19,991.50x = 29,987.97 × 7,510.21
  4. Step 4: Simplify right side
    19,991.50x = 225,215,952.17
  5. Step 5: Solve for x
    x = 225,215,952.17/19,991.50
  6. Step 6: Final answer
    x = 11,265.59

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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.