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Finding the Fourth Proportional to 285,385.10, 428,081.82 and 135,640.67

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Solution

The fourth proportional to 285,385.10, 428,081.82 and 135,640.67 is: 203,462.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,385.10 : 428,081.82 = 135,640.67 : x
  2. Step 2: Convert to fraction form
    285,385.10/428,081.82 = 135,640.67/x
  3. Step 3: Cross multiply
    285,385.10x = 428,081.82 × 135,640.67
  4. Step 4: Simplify right side
    285,385.10x = 58,065,304,879.62
  5. Step 5: Solve for x
    x = 58,065,304,879.62/285,385.10
  6. Step 6: Final answer
    x = 203,462.99

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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.