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Finding the Fourth Proportional to 38,280, 57,420 and 10,578

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Solution

The fourth proportional to 38,280, 57,420 and 10,578 is: 15,867

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,280 : 57,420 = 10,578 : x
  2. Step 2: Convert to fraction form
    38,280/57,420 = 10,578/x
  3. Step 3: Cross multiply
    38,280x = 57,420 × 10,578
  4. Step 4: Simplify right side
    38,280x = 607,388,760
  5. Step 5: Solve for x
    x = 607,388,760/38,280
  6. Step 6: Final answer
    x = 15,867

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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.