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Finding the Fourth Proportional to 13,428, 20,142 and 5,220

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Solution

The fourth proportional to 13,428, 20,142 and 5,220 is: 7,830

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428 : 20,142 = 5,220 : x
  2. Step 2: Convert to fraction form
    13,428/20,142 = 5,220/x
  3. Step 3: Cross multiply
    13,428x = 20,142 × 5,220
  4. Step 4: Simplify right side
    13,428x = 105,141,240
  5. Step 5: Solve for x
    x = 105,141,240/13,428
  6. Step 6: Final answer
    x = 7,830

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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.