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Finding the Fourth Proportional to 18,808.61, 25,955.69 and 10,311.20

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Solution

The fourth proportional to 18,808.61, 25,955.69 and 10,311.20 is: 14,229.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.61 : 25,955.69 = 10,311.20 : x
  2. Step 2: Convert to fraction form
    18,808.61/25,955.69 = 10,311.20/x
  3. Step 3: Cross multiply
    18,808.61x = 25,955.69 × 10,311.20
  4. Step 4: Simplify right side
    18,808.61x = 267,634,129.39
  5. Step 5: Solve for x
    x = 267,634,129.39/18,808.61
  6. Step 6: Final answer
    x = 14,229.34

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Half scale
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Double scale
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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.