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Finding the Fourth Proportional to 13,920.40, 20,880.30 and 9,270.20

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Solution

The fourth proportional to 13,920.40, 20,880.30 and 9,270.20 is: 13,905.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.40 : 20,880.30 = 9,270.20 : x
  2. Step 2: Convert to fraction form
    13,920.40/20,880.30 = 9,270.20/x
  3. Step 3: Cross multiply
    13,920.40x = 20,880.30 × 9,270.20
  4. Step 4: Simplify right side
    13,920.40x = 193,564,557.06
  5. Step 5: Solve for x
    x = 193,564,557.06/13,920.40
  6. Step 6: Final answer
    x = 13,905.10

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1.5x scale

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.