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Finding the Fourth Proportional to 28,878, 43,317 and 6,990

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Solution

The fourth proportional to 28,878, 43,317 and 6,990 is: 10,485

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,878 : 43,317 = 6,990 : x
  2. Step 2: Convert to fraction form
    28,878/43,317 = 6,990/x
  3. Step 3: Cross multiply
    28,878x = 43,317 × 6,990
  4. Step 4: Simplify right side
    28,878x = 302,785,830
  5. Step 5: Solve for x
    x = 302,785,830/28,878
  6. Step 6: Final answer
    x = 10,485

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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.