Home / 7,121.69-9,828.42-3,935.08

Finding the Fourth Proportional to 7,121.69, 9,828.42 and 3,935.08

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Solution

The fourth proportional to 7,121.69, 9,828.42 and 3,935.08 is: 5,430.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.69 : 9,828.42 = 3,935.08 : x
  2. Step 2: Convert to fraction form
    7,121.69/9,828.42 = 3,935.08/x
  3. Step 3: Cross multiply
    7,121.69x = 9,828.42 × 3,935.08
  4. Step 4: Simplify right side
    7,121.69x = 38,675,569.83
  5. Step 5: Solve for x
    x = 38,675,569.83/7,121.69
  6. Step 6: Final answer
    x = 5,430.68

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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.