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Finding the Fourth Proportional to 18,861.94, 28,292.40 and 6,381.88

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Solution

The fourth proportional to 18,861.94, 28,292.40 and 6,381.88 is: 9,572.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.94 : 28,292.40 = 6,381.88 : x
  2. Step 2: Convert to fraction form
    18,861.94/28,292.40 = 6,381.88/x
  3. Step 3: Cross multiply
    18,861.94x = 28,292.40 × 6,381.88
  4. Step 4: Simplify right side
    18,861.94x = 180,558,701.71
  5. Step 5: Solve for x
    x = 180,558,701.71/18,861.94
  6. Step 6: Final answer
    x = 9,572.65

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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.