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Finding the Fourth Proportional to 20,871.36, 31,311.36 and 7,020

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Solution

The fourth proportional to 20,871.36, 31,311.36 and 7,020 is: 10,531.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.36 : 31,311.36 = 7,020 : x
  2. Step 2: Convert to fraction form
    20,871.36/31,311.36 = 7,020/x
  3. Step 3: Cross multiply
    20,871.36x = 31,311.36 × 7,020
  4. Step 4: Simplify right side
    20,871.36x = 219,805,747.20
  5. Step 5: Solve for x
    x = 219,805,747.20/20,871.36
  6. Step 6: Final answer
    x = 10,531.45

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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.