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Finding the Fourth Proportional to 28,991.80, 43,493.28 and 12,351.52

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Solution

The fourth proportional to 28,991.80, 43,493.28 and 12,351.52 is: 18,529.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,991.80 : 43,493.28 = 12,351.52 : x
  2. Step 2: Convert to fraction form
    28,991.80/43,493.28 = 12,351.52/x
  3. Step 3: Cross multiply
    28,991.80x = 43,493.28 × 12,351.52
  4. Step 4: Simplify right side
    28,991.80x = 537,208,117.79
  5. Step 5: Solve for x
    x = 537,208,117.79/28,991.80
  6. Step 6: Final answer
    x = 18,529.66

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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.