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Finding the Fourth Proportional to 5,328.66, 7,986.76 and 3,138.92

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Solution

The fourth proportional to 5,328.66, 7,986.76 and 3,138.92 is: 4,704.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,328.66 : 7,986.76 = 3,138.92 : x
  2. Step 2: Convert to fraction form
    5,328.66/7,986.76 = 3,138.92/x
  3. Step 3: Cross multiply
    5,328.66x = 7,986.76 × 3,138.92
  4. Step 4: Simplify right side
    5,328.66x = 25,069,812.82
  5. Step 5: Solve for x
    x = 25,069,812.82/5,328.66
  6. Step 6: Final answer
    x = 4,704.72

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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.