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Finding the Fourth Proportional to 86,616, 129,924 and 20,952

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Solution

The fourth proportional to 86,616, 129,924 and 20,952 is: 31,428

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,616 : 129,924 = 20,952 : x
  2. Step 2: Convert to fraction form
    86,616/129,924 = 20,952/x
  3. Step 3: Cross multiply
    86,616x = 129,924 × 20,952
  4. Step 4: Simplify right side
    86,616x = 2,722,167,648
  5. Step 5: Solve for x
    x = 2,722,167,648/86,616
  6. Step 6: Final answer
    x = 31,428

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.