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Finding the Fourth Proportional to 135,299.89, 186,751.38 and 78,722.20

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Solution

The fourth proportional to 135,299.89, 186,751.38 and 78,722.20 is: 108,658.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,299.89 : 186,751.38 = 78,722.20 : x
  2. Step 2: Convert to fraction form
    135,299.89/186,751.38 = 78,722.20/x
  3. Step 3: Cross multiply
    135,299.89x = 186,751.38 × 78,722.20
  4. Step 4: Simplify right side
    135,299.89x = 14,701,479,486.64
  5. Step 5: Solve for x
    x = 14,701,479,486.64/135,299.89
  6. Step 6: Final answer
    x = 108,658.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.