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Finding the Fourth Proportional to 28,881, 39,855.90 and 15,633

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Solution

The fourth proportional to 28,881, 39,855.90 and 15,633 is: 21,573.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,881 : 39,855.90 = 15,633 : x
  2. Step 2: Convert to fraction form
    28,881/39,855.90 = 15,633/x
  3. Step 3: Cross multiply
    28,881x = 39,855.90 × 15,633
  4. Step 4: Simplify right side
    28,881x = 623,067,284.70
  5. Step 5: Solve for x
    x = 623,067,284.70/28,881
  6. Step 6: Final answer
    x = 21,573.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.