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Finding the Fourth Proportional to 7,221.87, 9,964.76 and 4,238.64

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Solution

The fourth proportional to 7,221.87, 9,964.76 and 4,238.64 is: 5,848.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.87 : 9,964.76 = 4,238.64 : x
  2. Step 2: Convert to fraction form
    7,221.87/9,964.76 = 4,238.64/x
  3. Step 3: Cross multiply
    7,221.87x = 9,964.76 × 4,238.64
  4. Step 4: Simplify right side
    7,221.87x = 42,237,009.13
  5. Step 5: Solve for x
    x = 42,237,009.13/7,221.87
  6. Step 6: Final answer
    x = 5,848.49

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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.