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Finding the Fourth Proportional to 18,726.90, 28,066.06 and 7,620.66

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Solution

The fourth proportional to 18,726.90, 28,066.06 and 7,620.66 is: 11,421.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726.90 : 28,066.06 = 7,620.66 : x
  2. Step 2: Convert to fraction form
    18,726.90/28,066.06 = 7,620.66/x
  3. Step 3: Cross multiply
    18,726.90x = 28,066.06 × 7,620.66
  4. Step 4: Simplify right side
    18,726.90x = 213,881,900.80
  5. Step 5: Solve for x
    x = 213,881,900.80/18,726.90
  6. Step 6: Final answer
    x = 11,421.11

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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.