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Finding the Fourth Proportional to 18,871.70, 28,311.62 and 5,725.13

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Solution

The fourth proportional to 18,871.70, 28,311.62 and 5,725.13 is: 8,588.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.70 : 28,311.62 = 5,725.13 : x
  2. Step 2: Convert to fraction form
    18,871.70/28,311.62 = 5,725.13/x
  3. Step 3: Cross multiply
    18,871.70x = 28,311.62 × 5,725.13
  4. Step 4: Simplify right side
    18,871.70x = 162,087,534.83
  5. Step 5: Solve for x
    x = 162,087,534.83/18,871.70
  6. Step 6: Final answer
    x = 8,588.92

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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.