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Finding the Fourth Proportional to 86,552, 129,828 and 20,888

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Solution

The fourth proportional to 86,552, 129,828 and 20,888 is: 31,332

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,552 : 129,828 = 20,888 : x
  2. Step 2: Convert to fraction form
    86,552/129,828 = 20,888/x
  3. Step 3: Cross multiply
    86,552x = 129,828 × 20,888
  4. Step 4: Simplify right side
    86,552x = 2,711,847,264
  5. Step 5: Solve for x
    x = 2,711,847,264/86,552
  6. Step 6: Final answer
    x = 31,332

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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.