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Finding the Fourth Proportional to 18,987.82, 28,487.82 and 9,127.81

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Solution

The fourth proportional to 18,987.82, 28,487.82 and 9,127.81 is: 13,694.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.82 : 28,487.82 = 9,127.81 : x
  2. Step 2: Convert to fraction form
    18,987.82/28,487.82 = 9,127.81/x
  3. Step 3: Cross multiply
    18,987.82x = 28,487.82 × 9,127.81
  4. Step 4: Simplify right side
    18,987.82x = 260,031,408.27
  5. Step 5: Solve for x
    x = 260,031,408.27/18,987.82
  6. Step 6: Final answer
    x = 13,694.64

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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.