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Finding the Fourth Proportional to 7,347.70, 10,139.90 and 3,990.54

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Solution

The fourth proportional to 7,347.70, 10,139.90 and 3,990.54 is: 5,506.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.70 : 10,139.90 = 3,990.54 : x
  2. Step 2: Convert to fraction form
    7,347.70/10,139.90 = 3,990.54/x
  3. Step 3: Cross multiply
    7,347.70x = 10,139.90 × 3,990.54
  4. Step 4: Simplify right side
    7,347.70x = 40,463,676.55
  5. Step 5: Solve for x
    x = 40,463,676.55/7,347.70
  6. Step 6: Final answer
    x = 5,506.99

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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.