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Finding the Fourth Proportional to 430.07, 645.14 and 137.61

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Solution

The fourth proportional to 430.07, 645.14 and 137.61 is: 206.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.07 : 645.14 = 137.61 : x
  2. Step 2: Convert to fraction form
    430.07/645.14 = 137.61/x
  3. Step 3: Cross multiply
    430.07x = 645.14 × 137.61
  4. Step 4: Simplify right side
    430.07x = 88,777.72
  5. Step 5: Solve for x
    x = 88,777.72/430.07
  6. Step 6: Final answer
    x = 206.43

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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.