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Finding the Fourth Proportional to 12,750.21, 19,120.59 and 4,428

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Solution

The fourth proportional to 12,750.21, 19,120.59 and 4,428 is: 6,640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,750.21 : 19,120.59 = 4,428 : x
  2. Step 2: Convert to fraction form
    12,750.21/19,120.59 = 4,428/x
  3. Step 3: Cross multiply
    12,750.21x = 19,120.59 × 4,428
  4. Step 4: Simplify right side
    12,750.21x = 84,665,972.52
  5. Step 5: Solve for x
    x = 84,665,972.52/12,750.21
  6. Step 6: Final answer
    x = 6,640.36

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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.