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Finding the Fourth Proportional to 124,909.76, 172,431.77 and 79,648.58

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Solution

The fourth proportional to 124,909.76, 172,431.77 and 79,648.58 is: 109,950.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,909.76 : 172,431.77 = 79,648.58 : x
  2. Step 2: Convert to fraction form
    124,909.76/172,431.77 = 79,648.58/x
  3. Step 3: Cross multiply
    124,909.76x = 172,431.77 × 79,648.58
  4. Step 4: Simplify right side
    124,909.76x = 13,733,945,660.22
  5. Step 5: Solve for x
    x = 13,733,945,660.22/124,909.76
  6. Step 6: Final answer
    x = 109,950.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.