Home / 7,121.80-9,827.88-3,935.17

Finding the Fourth Proportional to 7,121.80, 9,827.88 and 3,935.17

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Solution

The fourth proportional to 7,121.80, 9,827.88 and 3,935.17 is: 5,430.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.80 : 9,827.88 = 3,935.17 : x
  2. Step 2: Convert to fraction form
    7,121.80/9,827.88 = 3,935.17/x
  3. Step 3: Cross multiply
    7,121.80x = 9,827.88 × 3,935.17
  4. Step 4: Simplify right side
    7,121.80x = 38,674,378.54
  5. Step 5: Solve for x
    x = 38,674,378.54/7,121.80
  6. Step 6: Final answer
    x = 5,430.42

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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.