Home / 7,277.20-10,915.80-3,121.90

Finding the Fourth Proportional to 7,277.20, 10,915.80 and 3,121.90

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Solution

The fourth proportional to 7,277.20, 10,915.80 and 3,121.90 is: 4,682.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,277.20 : 10,915.80 = 3,121.90 : x
  2. Step 2: Convert to fraction form
    7,277.20/10,915.80 = 3,121.90/x
  3. Step 3: Cross multiply
    7,277.20x = 10,915.80 × 3,121.90
  4. Step 4: Simplify right side
    7,277.20x = 34,078,036.02
  5. Step 5: Solve for x
    x = 34,078,036.02/7,277.20
  6. Step 6: Final answer
    x = 4,682.85

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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.