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Finding the Fourth Proportional to 18,761.22, 28,141.88 and 7,521.66

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Solution

The fourth proportional to 18,761.22, 28,141.88 and 7,521.66 is: 11,282.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.22 : 28,141.88 = 7,521.66 : x
  2. Step 2: Convert to fraction form
    18,761.22/28,141.88 = 7,521.66/x
  3. Step 3: Cross multiply
    18,761.22x = 28,141.88 × 7,521.66
  4. Step 4: Simplify right side
    18,761.22x = 211,673,615.51
  5. Step 5: Solve for x
    x = 211,673,615.51/18,761.22
  6. Step 6: Final answer
    x = 11,282.51

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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.