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Finding the Fourth Proportional to 21,950.76, 32,913.18 and 7,909.68

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Solution

The fourth proportional to 21,950.76, 32,913.18 and 7,909.68 is: 11,859.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,950.76 : 32,913.18 = 7,909.68 : x
  2. Step 2: Convert to fraction form
    21,950.76/32,913.18 = 7,909.68/x
  3. Step 3: Cross multiply
    21,950.76x = 32,913.18 × 7,909.68
  4. Step 4: Simplify right side
    21,950.76x = 260,332,721.58
  5. Step 5: Solve for x
    x = 260,332,721.58/21,950.76
  6. Step 6: Final answer
    x = 11,859.85

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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.