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Finding the Fourth Proportional to 18,986.31, 28,471.53 and 6,503.79

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Solution

The fourth proportional to 18,986.31, 28,471.53 and 6,503.79 is: 9,752.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.31 : 28,471.53 = 6,503.79 : x
  2. Step 2: Convert to fraction form
    18,986.31/28,471.53 = 6,503.79/x
  3. Step 3: Cross multiply
    18,986.31x = 28,471.53 × 6,503.79
  4. Step 4: Simplify right side
    18,986.31x = 185,172,852.10
  5. Step 5: Solve for x
    x = 185,172,852.10/18,986.31
  6. Step 6: Final answer
    x = 9,752.97

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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.