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Finding the Fourth Proportional to 13,957.60, 20,936.40 and 12,402.40

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Solution

The fourth proportional to 13,957.60, 20,936.40 and 12,402.40 is: 18,603.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,957.60 : 20,936.40 = 12,402.40 : x
  2. Step 2: Convert to fraction form
    13,957.60/20,936.40 = 12,402.40/x
  3. Step 3: Cross multiply
    13,957.60x = 20,936.40 × 12,402.40
  4. Step 4: Simplify right side
    13,957.60x = 259,661,607.36
  5. Step 5: Solve for x
    x = 259,661,607.36/13,957.60
  6. Step 6: Final answer
    x = 18,603.60

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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.