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Finding the Fourth Proportional to 7,112.79, 9,816.08 and 3,968.91

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Solution

The fourth proportional to 7,112.79, 9,816.08 and 3,968.91 is: 5,477.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.79 : 9,816.08 = 3,968.91 : x
  2. Step 2: Convert to fraction form
    7,112.79/9,816.08 = 3,968.91/x
  3. Step 3: Cross multiply
    7,112.79x = 9,816.08 × 3,968.91
  4. Step 4: Simplify right side
    7,112.79x = 38,959,118.23
  5. Step 5: Solve for x
    x = 38,959,118.23/7,112.79
  6. Step 6: Final answer
    x = 5,477.33

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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.