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Finding the Fourth Proportional to 21,021.71, 31,524.68 and 6,979.14

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Solution

The fourth proportional to 21,021.71, 31,524.68 and 6,979.14 is: 10,466.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.71 : 31,524.68 = 6,979.14 : x
  2. Step 2: Convert to fraction form
    21,021.71/31,524.68 = 6,979.14/x
  3. Step 3: Cross multiply
    21,021.71x = 31,524.68 × 6,979.14
  4. Step 4: Simplify right side
    21,021.71x = 220,015,172.62
  5. Step 5: Solve for x
    x = 220,015,172.62/21,021.71
  6. Step 6: Final answer
    x = 10,466.10

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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.