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Finding the Fourth Proportional to 18,989.98, 28,484.86 and 7,745.28

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Solution

The fourth proportional to 18,989.98, 28,484.86 and 7,745.28 is: 11,617.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.98 : 28,484.86 = 7,745.28 : x
  2. Step 2: Convert to fraction form
    18,989.98/28,484.86 = 7,745.28/x
  3. Step 3: Cross multiply
    18,989.98x = 28,484.86 × 7,745.28
  4. Step 4: Simplify right side
    18,989.98x = 220,623,216.46
  5. Step 5: Solve for x
    x = 220,623,216.46/18,989.98
  6. Step 6: Final answer
    x = 11,617.88

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Similar ratio
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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.