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Finding the Fourth Proportional to 20,988, 31,482.12 and 7,137.12

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Solution

The fourth proportional to 20,988, 31,482.12 and 7,137.12 is: 10,705.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988 : 31,482.12 = 7,137.12 : x
  2. Step 2: Convert to fraction form
    20,988/31,482.12 = 7,137.12/x
  3. Step 3: Cross multiply
    20,988x = 31,482.12 × 7,137.12
  4. Step 4: Simplify right side
    20,988x = 224,691,668.29
  5. Step 5: Solve for x
    x = 224,691,668.29/20,988
  6. Step 6: Final answer
    x = 10,705.72

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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.