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Finding the Fourth Proportional to 13,710.20, 18,920 and 7,422.60

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Solution

The fourth proportional to 13,710.20, 18,920 and 7,422.60 is: 10,243.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.20 : 18,920 = 7,422.60 : x
  2. Step 2: Convert to fraction form
    13,710.20/18,920 = 7,422.60/x
  3. Step 3: Cross multiply
    13,710.20x = 18,920 × 7,422.60
  4. Step 4: Simplify right side
    13,710.20x = 140,435,592
  5. Step 5: Solve for x
    x = 140,435,592/13,710.20
  6. Step 6: Final answer
    x = 10,243.15

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1.5x scale

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.