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Finding the Fourth Proportional to 20,317.55, 30,479.71 and 6,990

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Solution

The fourth proportional to 20,317.55, 30,479.71 and 6,990 is: 10,486.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,317.55 : 30,479.71 = 6,990 : x
  2. Step 2: Convert to fraction form
    20,317.55/30,479.71 = 6,990/x
  3. Step 3: Cross multiply
    20,317.55x = 30,479.71 × 6,990
  4. Step 4: Simplify right side
    20,317.55x = 213,053,172.90
  5. Step 5: Solve for x
    x = 213,053,172.90/20,317.55
  6. Step 6: Final answer
    x = 10,486.16

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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.