Home / 7,121.52-9,828.08-3,977.68

Finding the Fourth Proportional to 7,121.52, 9,828.08 and 3,977.68

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Solution

The fourth proportional to 7,121.52, 9,828.08 and 3,977.68 is: 5,489.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.52 : 9,828.08 = 3,977.68 : x
  2. Step 2: Convert to fraction form
    7,121.52/9,828.08 = 3,977.68/x
  3. Step 3: Cross multiply
    7,121.52x = 9,828.08 × 3,977.68
  4. Step 4: Simplify right side
    7,121.52x = 39,092,957.25
  5. Step 5: Solve for x
    x = 39,092,957.25/7,121.52
  6. Step 6: Final answer
    x = 5,489.41

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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.