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Finding the Fourth Proportional to 112,992, 169,488 and 39,120

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Solution

The fourth proportional to 112,992, 169,488 and 39,120 is: 58,680

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,992 : 169,488 = 39,120 : x
  2. Step 2: Convert to fraction form
    112,992/169,488 = 39,120/x
  3. Step 3: Cross multiply
    112,992x = 169,488 × 39,120
  4. Step 4: Simplify right side
    112,992x = 6,630,370,560
  5. Step 5: Solve for x
    x = 6,630,370,560/112,992
  6. Step 6: Final answer
    x = 58,680

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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.