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Finding the Fourth Proportional to 18,726.66, 28,039.32 and 11,689.83

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Solution

The fourth proportional to 18,726.66, 28,039.32 and 11,689.83 is: 17,503.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726.66 : 28,039.32 = 11,689.83 : x
  2. Step 2: Convert to fraction form
    18,726.66/28,039.32 = 11,689.83/x
  3. Step 3: Cross multiply
    18,726.66x = 28,039.32 × 11,689.83
  4. Step 4: Simplify right side
    18,726.66x = 327,774,884.12
  5. Step 5: Solve for x
    x = 327,774,884.12/18,726.66
  6. Step 6: Final answer
    x = 17,503.12

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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.