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Finding the Fourth Proportional to 18,919.47, 28,330.76 and 15,791.71

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Solution

The fourth proportional to 18,919.47, 28,330.76 and 15,791.71 is: 23,647.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.47 : 28,330.76 = 15,791.71 : x
  2. Step 2: Convert to fraction form
    18,919.47/28,330.76 = 15,791.71/x
  3. Step 3: Cross multiply
    18,919.47x = 28,330.76 × 15,791.71
  4. Step 4: Simplify right side
    18,919.47x = 447,391,167.77
  5. Step 5: Solve for x
    x = 447,391,167.77/18,919.47
  6. Step 6: Final answer
    x = 23,647.13

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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.