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Finding the Fourth Proportional to 430.37, 645.67 and 137.88

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Solution

The fourth proportional to 430.37, 645.67 and 137.88 is: 206.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.37 : 645.67 = 137.88 : x
  2. Step 2: Convert to fraction form
    430.37/645.67 = 137.88/x
  3. Step 3: Cross multiply
    430.37x = 645.67 × 137.88
  4. Step 4: Simplify right side
    430.37x = 89,021.41
  5. Step 5: Solve for x
    x = 89,021.41/430.37
  6. Step 6: Final answer
    x = 206.85

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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.