Home / 7,139.72-9,853.84-4,157.20

Finding the Fourth Proportional to 7,139.72, 9,853.84 and 4,157.20

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Solution

The fourth proportional to 7,139.72, 9,853.84 and 4,157.20 is: 5,737.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.72 : 9,853.84 = 4,157.20 : x
  2. Step 2: Convert to fraction form
    7,139.72/9,853.84 = 4,157.20/x
  3. Step 3: Cross multiply
    7,139.72x = 9,853.84 × 4,157.20
  4. Step 4: Simplify right side
    7,139.72x = 40,964,367.60
  5. Step 5: Solve for x
    x = 40,964,367.60/7,139.72
  6. Step 6: Final answer
    x = 5,737.53

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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.