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Finding the Fourth Proportional to 20,494.32, 30,719.34 and 9,942

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Solution

The fourth proportional to 20,494.32, 30,719.34 and 9,942 is: 14,902.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,494.32 : 30,719.34 = 9,942 : x
  2. Step 2: Convert to fraction form
    20,494.32/30,719.34 = 9,942/x
  3. Step 3: Cross multiply
    20,494.32x = 30,719.34 × 9,942
  4. Step 4: Simplify right side
    20,494.32x = 305,411,678.28
  5. Step 5: Solve for x
    x = 305,411,678.28/20,494.32
  6. Step 6: Final answer
    x = 14,902.26

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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.