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Finding the Fourth Proportional to 7,216.80, 9,955.20 and 4,231.20

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Solution

The fourth proportional to 7,216.80, 9,955.20 and 4,231.20 is: 5,836.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,216.80 : 9,955.20 = 4,231.20 : x
  2. Step 2: Convert to fraction form
    7,216.80/9,955.20 = 4,231.20/x
  3. Step 3: Cross multiply
    7,216.80x = 9,955.20 × 4,231.20
  4. Step 4: Simplify right side
    7,216.80x = 42,122,442.24
  5. Step 5: Solve for x
    x = 42,122,442.24/7,216.80
  6. Step 6: Final answer
    x = 5,836.72

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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.