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Finding the Fourth Proportional to 5,679.82, 7,839.45 and 3,686.92

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Solution

The fourth proportional to 5,679.82, 7,839.45 and 3,686.92 is: 5,088.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.82 : 7,839.45 = 3,686.92 : x
  2. Step 2: Convert to fraction form
    5,679.82/7,839.45 = 3,686.92/x
  3. Step 3: Cross multiply
    5,679.82x = 7,839.45 × 3,686.92
  4. Step 4: Simplify right side
    5,679.82x = 28,903,389.84
  5. Step 5: Solve for x
    x = 28,903,389.84/5,679.82
  6. Step 6: Final answer
    x = 5,088.79

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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.