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Finding the Fourth Proportional to 18,861.84, 28,300.96 and 7,178.40

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Solution

The fourth proportional to 18,861.84, 28,300.96 and 7,178.40 is: 10,770.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.84 : 28,300.96 = 7,178.40 : x
  2. Step 2: Convert to fraction form
    18,861.84/28,300.96 = 7,178.40/x
  3. Step 3: Cross multiply
    18,861.84x = 28,300.96 × 7,178.40
  4. Step 4: Simplify right side
    18,861.84x = 203,155,611.26
  5. Step 5: Solve for x
    x = 203,155,611.26/18,861.84
  6. Step 6: Final answer
    x = 10,770.72

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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.