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Finding the Fourth Proportional to 12,487.80, 18,728.70 and 7,211.40

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Solution

The fourth proportional to 12,487.80, 18,728.70 and 7,211.40 is: 10,815.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.80 : 18,728.70 = 7,211.40 : x
  2. Step 2: Convert to fraction form
    12,487.80/18,728.70 = 7,211.40/x
  3. Step 3: Cross multiply
    12,487.80x = 18,728.70 × 7,211.40
  4. Step 4: Simplify right side
    12,487.80x = 135,060,147.18
  5. Step 5: Solve for x
    x = 135,060,147.18/12,487.80
  6. Step 6: Final answer
    x = 10,815.37

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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.