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Finding the Fourth Proportional to 18,990.97, 28,486.35 and 7,746.28

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Solution

The fourth proportional to 18,990.97, 28,486.35 and 7,746.28 is: 11,619.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.97 : 28,486.35 = 7,746.28 : x
  2. Step 2: Convert to fraction form
    18,990.97/28,486.35 = 7,746.28/x
  3. Step 3: Cross multiply
    18,990.97x = 28,486.35 × 7,746.28
  4. Step 4: Simplify right side
    18,990.97x = 220,663,243.28
  5. Step 5: Solve for x
    x = 220,663,243.28/18,990.97
  6. Step 6: Final answer
    x = 11,619.38

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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.