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Finding the Fourth Proportional to 7,347.87, 10,140.08 and 3,990.65

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Solution

The fourth proportional to 7,347.87, 10,140.08 and 3,990.65 is: 5,507.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.87 : 10,140.08 = 3,990.65 : x
  2. Step 2: Convert to fraction form
    7,347.87/10,140.08 = 3,990.65/x
  3. Step 3: Cross multiply
    7,347.87x = 10,140.08 × 3,990.65
  4. Step 4: Simplify right side
    7,347.87x = 40,465,439.60
  5. Step 5: Solve for x
    x = 40,465,439.60/7,347.87
  6. Step 6: Final answer
    x = 5,507.10

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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.