Home / 7,116.78-9,820.80-3,972.36

Finding the Fourth Proportional to 7,116.78, 9,820.80 and 3,972.36

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Solution

The fourth proportional to 7,116.78, 9,820.80 and 3,972.36 is: 5,481.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,116.78 : 9,820.80 = 3,972.36 : x
  2. Step 2: Convert to fraction form
    7,116.78/9,820.80 = 3,972.36/x
  3. Step 3: Cross multiply
    7,116.78x = 9,820.80 × 3,972.36
  4. Step 4: Simplify right side
    7,116.78x = 39,011,753.09
  5. Step 5: Solve for x
    x = 39,011,753.09/7,116.78
  6. Step 6: Final answer
    x = 5,481.66

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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.