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Finding the Fourth Proportional to 5,426.16, 8,140 and 1,728

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Solution

The fourth proportional to 5,426.16, 8,140 and 1,728 is: 2,592.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,426.16 : 8,140 = 1,728 : x
  2. Step 2: Convert to fraction form
    5,426.16/8,140 = 1,728/x
  3. Step 3: Cross multiply
    5,426.16x = 8,140 × 1,728
  4. Step 4: Simplify right side
    5,426.16x = 14,065,920
  5. Step 5: Solve for x
    x = 14,065,920/5,426.16
  6. Step 6: Final answer
    x = 2,592.24

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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.