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Finding the Fourth Proportional to 5,015.76, 7,521.84 and 1,728

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Solution

The fourth proportional to 5,015.76, 7,521.84 and 1,728 is: 2,591.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,015.76 : 7,521.84 = 1,728 : x
  2. Step 2: Convert to fraction form
    5,015.76/7,521.84 = 1,728/x
  3. Step 3: Cross multiply
    5,015.76x = 7,521.84 × 1,728
  4. Step 4: Simplify right side
    5,015.76x = 12,997,739.52
  5. Step 5: Solve for x
    x = 12,997,739.52/5,015.76
  6. Step 6: Final answer
    x = 2,591.38

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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.