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Finding the Fourth Proportional to 7,145.70, 10,718.55 and 2,990.40

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Solution

The fourth proportional to 7,145.70, 10,718.55 and 2,990.40 is: 4,485.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145.70 : 10,718.55 = 2,990.40 : x
  2. Step 2: Convert to fraction form
    7,145.70/10,718.55 = 2,990.40/x
  3. Step 3: Cross multiply
    7,145.70x = 10,718.55 × 2,990.40
  4. Step 4: Simplify right side
    7,145.70x = 32,052,751.92
  5. Step 5: Solve for x
    x = 32,052,751.92/7,145.70
  6. Step 6: Final answer
    x = 4,485.60

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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.