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Finding the Fourth Proportional to 18,861.72, 28,281.74 and 7,776.06

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Solution

The fourth proportional to 18,861.72, 28,281.74 and 7,776.06 is: 11,659.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.72 : 28,281.74 = 7,776.06 : x
  2. Step 2: Convert to fraction form
    18,861.72/28,281.74 = 7,776.06/x
  3. Step 3: Cross multiply
    18,861.72x = 28,281.74 × 7,776.06
  4. Step 4: Simplify right side
    18,861.72x = 219,920,507.14
  5. Step 5: Solve for x
    x = 219,920,507.14/18,861.72
  6. Step 6: Final answer
    x = 11,659.62

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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.