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Finding the Fourth Proportional to 5,428, 8,142 and 1,324

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Solution

The fourth proportional to 5,428, 8,142 and 1,324 is: 1,986

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428 : 8,142 = 1,324 : x
  2. Step 2: Convert to fraction form
    5,428/8,142 = 1,324/x
  3. Step 3: Cross multiply
    5,428x = 8,142 × 1,324
  4. Step 4: Simplify right side
    5,428x = 10,780,008
  5. Step 5: Solve for x
    x = 10,780,008/5,428
  6. Step 6: Final answer
    x = 1,986

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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.