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Finding the Fourth Proportional to 18,871.79, 28,307.69 and 8,471.39

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Solution

The fourth proportional to 18,871.79, 28,307.69 and 8,471.39 is: 12,707.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.79 : 28,307.69 = 8,471.39 : x
  2. Step 2: Convert to fraction form
    18,871.79/28,307.69 = 8,471.39/x
  3. Step 3: Cross multiply
    18,871.79x = 28,307.69 × 8,471.39
  4. Step 4: Simplify right side
    18,871.79x = 239,805,481.99
  5. Step 5: Solve for x
    x = 239,805,481.99/18,871.79
  6. Step 6: Final answer
    x = 12,707.09

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1.5x scale

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.