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Finding the Fourth Proportional to 18,782.38, 28,173.77 and 4,931.38

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Solution

The fourth proportional to 18,782.38, 28,173.77 and 4,931.38 is: 7,397.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,782.38 : 28,173.77 = 4,931.38 : x
  2. Step 2: Convert to fraction form
    18,782.38/28,173.77 = 4,931.38/x
  3. Step 3: Cross multiply
    18,782.38x = 28,173.77 × 4,931.38
  4. Step 4: Simplify right side
    18,782.38x = 138,935,400.38
  5. Step 5: Solve for x
    x = 138,935,400.38/18,782.38
  6. Step 6: Final answer
    x = 7,397.12

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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.