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Finding the Fourth Proportional to 18,753.40, 25,881.78 and 13,715.20

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Solution

The fourth proportional to 18,753.40, 25,881.78 and 13,715.20 is: 18,928.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,753.40 : 25,881.78 = 13,715.20 : x
  2. Step 2: Convert to fraction form
    18,753.40/25,881.78 = 13,715.20/x
  3. Step 3: Cross multiply
    18,753.40x = 25,881.78 × 13,715.20
  4. Step 4: Simplify right side
    18,753.40x = 354,973,789.06
  5. Step 5: Solve for x
    x = 354,973,789.06/18,753.40
  6. Step 6: Final answer
    x = 18,928.50

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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.