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Finding the Fourth Proportional to 5,165.69, 7,129.95 and 2,928.90

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Solution

The fourth proportional to 5,165.69, 7,129.95 and 2,928.90 is: 4,042.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,165.69 : 7,129.95 = 2,928.90 : x
  2. Step 2: Convert to fraction form
    5,165.69/7,129.95 = 2,928.90/x
  3. Step 3: Cross multiply
    5,165.69x = 7,129.95 × 2,928.90
  4. Step 4: Simplify right side
    5,165.69x = 20,882,914.49
  5. Step 5: Solve for x
    x = 20,882,914.49/5,165.69
  6. Step 6: Final answer
    x = 4,042.62

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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.