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Finding the Fourth Proportional to 7,221.52, 9,969.90 and 4,986.64

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Solution

The fourth proportional to 7,221.52, 9,969.90 and 4,986.64 is: 6,884.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.52 : 9,969.90 = 4,986.64 : x
  2. Step 2: Convert to fraction form
    7,221.52/9,969.90 = 4,986.64/x
  3. Step 3: Cross multiply
    7,221.52x = 9,969.90 × 4,986.64
  4. Step 4: Simplify right side
    7,221.52x = 49,716,302.14
  5. Step 5: Solve for x
    x = 49,716,302.14/7,221.52
  6. Step 6: Final answer
    x = 6,884.47

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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.