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Finding the Fourth Proportional to 19,989.74, 29,990.82 and 7,510.88

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Solution

The fourth proportional to 19,989.74, 29,990.82 and 7,510.88 is: 11,268.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989.74 : 29,990.82 = 7,510.88 : x
  2. Step 2: Convert to fraction form
    19,989.74/29,990.82 = 7,510.88/x
  3. Step 3: Cross multiply
    19,989.74x = 29,990.82 × 7,510.88
  4. Step 4: Simplify right side
    19,989.74x = 225,257,450.12
  5. Step 5: Solve for x
    x = 225,257,450.12/19,989.74
  6. Step 6: Final answer
    x = 11,268.65

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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.