Home / 18,681.57-28,022.31-9,920.61

Finding the Fourth Proportional to 18,681.57, 28,022.31 and 9,920.61

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Solution

The fourth proportional to 18,681.57, 28,022.31 and 9,920.61 is: 14,880.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681.57 : 28,022.31 = 9,920.61 : x
  2. Step 2: Convert to fraction form
    18,681.57/28,022.31 = 9,920.61/x
  3. Step 3: Cross multiply
    18,681.57x = 28,022.31 × 9,920.61
  4. Step 4: Simplify right side
    18,681.57x = 277,998,408.81
  5. Step 5: Solve for x
    x = 277,998,408.81/18,681.57
  6. Step 6: Final answer
    x = 14,880.89

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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.