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Finding the Fourth Proportional to 18,990.90, 28,487.73 and 7,304.13

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Solution

The fourth proportional to 18,990.90, 28,487.73 and 7,304.13 is: 10,956.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.90 : 28,487.73 = 7,304.13 : x
  2. Step 2: Convert to fraction form
    18,990.90/28,487.73 = 7,304.13/x
  3. Step 3: Cross multiply
    18,990.90x = 28,487.73 × 7,304.13
  4. Step 4: Simplify right side
    18,990.90x = 208,078,083.32
  5. Step 5: Solve for x
    x = 208,078,083.32/18,990.90
  6. Step 6: Final answer
    x = 10,956.73

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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.