Home / 7,147.80-10,715.40-2,985.12

Finding the Fourth Proportional to 7,147.80, 10,715.40 and 2,985.12

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Solution

The fourth proportional to 7,147.80, 10,715.40 and 2,985.12 is: 4,475.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,147.80 : 10,715.40 = 2,985.12 : x
  2. Step 2: Convert to fraction form
    7,147.80/10,715.40 = 2,985.12/x
  3. Step 3: Cross multiply
    7,147.80x = 10,715.40 × 2,985.12
  4. Step 4: Simplify right side
    7,147.80x = 31,986,754.85
  5. Step 5: Solve for x
    x = 31,986,754.85/7,147.80
  6. Step 6: Final answer
    x = 4,475.05

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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.