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Finding the Fourth Proportional to 7,239.28, 9,979.48 and 5,107.86

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Solution

The fourth proportional to 7,239.28, 9,979.48 and 5,107.86 is: 7,041.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239.28 : 9,979.48 = 5,107.86 : x
  2. Step 2: Convert to fraction form
    7,239.28/9,979.48 = 5,107.86/x
  3. Step 3: Cross multiply
    7,239.28x = 9,979.48 × 5,107.86
  4. Step 4: Simplify right side
    7,239.28x = 50,973,786.71
  5. Step 5: Solve for x
    x = 50,973,786.71/7,239.28
  6. Step 6: Final answer
    x = 7,041.28

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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.