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Finding the Fourth Proportional to 13,712.78, 18,923.65 and 7,425.14

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Solution

The fourth proportional to 13,712.78, 18,923.65 and 7,425.14 is: 10,246.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,712.78 : 18,923.65 = 7,425.14 : x
  2. Step 2: Convert to fraction form
    13,712.78/18,923.65 = 7,425.14/x
  3. Step 3: Cross multiply
    13,712.78x = 18,923.65 × 7,425.14
  4. Step 4: Simplify right side
    13,712.78x = 140,510,750.56
  5. Step 5: Solve for x
    x = 140,510,750.56/13,712.78
  6. Step 6: Final answer
    x = 10,246.70

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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.