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Finding the Fourth Proportional to 18,885.76, 28,331.88 and 5,739.46

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Solution

The fourth proportional to 18,885.76, 28,331.88 and 5,739.46 is: 8,610.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.76 : 28,331.88 = 5,739.46 : x
  2. Step 2: Convert to fraction form
    18,885.76/28,331.88 = 5,739.46/x
  3. Step 3: Cross multiply
    18,885.76x = 28,331.88 × 5,739.46
  4. Step 4: Simplify right side
    18,885.76x = 162,609,691.98
  5. Step 5: Solve for x
    x = 162,609,691.98/18,885.76
  6. Step 6: Final answer
    x = 8,610.17

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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.