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Finding the Fourth Proportional to 7,216.76, 9,959.12 and 4,072.88

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Solution

The fourth proportional to 7,216.76, 9,959.12 and 4,072.88 is: 5,620.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,216.76 : 9,959.12 = 4,072.88 : x
  2. Step 2: Convert to fraction form
    7,216.76/9,959.12 = 4,072.88/x
  3. Step 3: Cross multiply
    7,216.76x = 9,959.12 × 4,072.88
  4. Step 4: Simplify right side
    7,216.76x = 40,562,300.67
  5. Step 5: Solve for x
    x = 40,562,300.67/7,216.76
  6. Step 6: Final answer
    x = 5,620.57

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Half scale
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Double scale
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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.