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Finding the Fourth Proportional to 5,289.40, 7,911.42 and 5,147.92

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Solution

The fourth proportional to 5,289.40, 7,911.42 and 5,147.92 is: 7,699.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,289.40 : 7,911.42 = 5,147.92 : x
  2. Step 2: Convert to fraction form
    5,289.40/7,911.42 = 5,147.92/x
  3. Step 3: Cross multiply
    5,289.40x = 7,911.42 × 5,147.92
  4. Step 4: Simplify right side
    5,289.40x = 40,727,357.25
  5. Step 5: Solve for x
    x = 40,727,357.25/5,289.40
  6. Step 6: Final answer
    x = 7,699.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.