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Finding the Fourth Proportional to 7,013.80, 9,679.23 and 3,989.42

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Solution

The fourth proportional to 7,013.80, 9,679.23 and 3,989.42 is: 5,505.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,013.80 : 9,679.23 = 3,989.42 : x
  2. Step 2: Convert to fraction form
    7,013.80/9,679.23 = 3,989.42/x
  3. Step 3: Cross multiply
    7,013.80x = 9,679.23 × 3,989.42
  4. Step 4: Simplify right side
    7,013.80x = 38,614,445.40
  5. Step 5: Solve for x
    x = 38,614,445.40/7,013.80
  6. Step 6: Final answer
    x = 5,505.50

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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.