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Finding the Fourth Proportional to 72,990, 109,485 and 17,586

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Solution

The fourth proportional to 72,990, 109,485 and 17,586 is: 26,379

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990 : 109,485 = 17,586 : x
  2. Step 2: Convert to fraction form
    72,990/109,485 = 17,586/x
  3. Step 3: Cross multiply
    72,990x = 109,485 × 17,586
  4. Step 4: Simplify right side
    72,990x = 1,925,403,210
  5. Step 5: Solve for x
    x = 1,925,403,210/72,990
  6. Step 6: Final answer
    x = 26,379

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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.