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Finding the Fourth Proportional to 12,420, 17,139.60 and 7,452

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Solution

The fourth proportional to 12,420, 17,139.60 and 7,452 is: 10,283.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420 : 17,139.60 = 7,452 : x
  2. Step 2: Convert to fraction form
    12,420/17,139.60 = 7,452/x
  3. Step 3: Cross multiply
    12,420x = 17,139.60 × 7,452
  4. Step 4: Simplify right side
    12,420x = 127,724,299.20
  5. Step 5: Solve for x
    x = 127,724,299.20/12,420
  6. Step 6: Final answer
    x = 10,283.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.