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Finding the Fourth Proportional to 7,078.88, 9,769.20 and 3,935

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Solution

The fourth proportional to 7,078.88, 9,769.20 and 3,935 is: 5,430.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,078.88 : 9,769.20 = 3,935 : x
  2. Step 2: Convert to fraction form
    7,078.88/9,769.20 = 3,935/x
  3. Step 3: Cross multiply
    7,078.88x = 9,769.20 × 3,935
  4. Step 4: Simplify right side
    7,078.88x = 38,441,802
  5. Step 5: Solve for x
    x = 38,441,802/7,078.88
  6. Step 6: Final answer
    x = 5,430.49

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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.