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Finding the Fourth Proportional to 18,841.28, 28,261.92 and 4,990.16

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Solution

The fourth proportional to 18,841.28, 28,261.92 and 4,990.16 is: 7,485.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,841.28 : 28,261.92 = 4,990.16 : x
  2. Step 2: Convert to fraction form
    18,841.28/28,261.92 = 4,990.16/x
  3. Step 3: Cross multiply
    18,841.28x = 28,261.92 × 4,990.16
  4. Step 4: Simplify right side
    18,841.28x = 141,031,502.71
  5. Step 5: Solve for x
    x = 141,031,502.71/18,841.28
  6. Step 6: Final answer
    x = 7,485.24

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.