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Finding the Fourth Proportional to 7,871.88, 10,864.08 and 4,890.54

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Solution

The fourth proportional to 7,871.88, 10,864.08 and 4,890.54 is: 6,749.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,871.88 : 10,864.08 = 4,890.54 : x
  2. Step 2: Convert to fraction form
    7,871.88/10,864.08 = 4,890.54/x
  3. Step 3: Cross multiply
    7,871.88x = 10,864.08 × 4,890.54
  4. Step 4: Simplify right side
    7,871.88x = 53,131,217.80
  5. Step 5: Solve for x
    x = 53,131,217.80/7,871.88
  6. Step 6: Final answer
    x = 6,749.50

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1.5x scale

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.