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Finding the Fourth Proportional to 79,888, 119,832 and 21,520

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Solution

The fourth proportional to 79,888, 119,832 and 21,520 is: 32,280

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,888 : 119,832 = 21,520 : x
  2. Step 2: Convert to fraction form
    79,888/119,832 = 21,520/x
  3. Step 3: Cross multiply
    79,888x = 119,832 × 21,520
  4. Step 4: Simplify right side
    79,888x = 2,578,784,640
  5. Step 5: Solve for x
    x = 2,578,784,640/79,888
  6. Step 6: Final answer
    x = 32,280

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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.