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Finding the Fourth Proportional to 430.66, 645.76 and 170.61

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Solution

The fourth proportional to 430.66, 645.76 and 170.61 is: 255.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.66 : 645.76 = 170.61 : x
  2. Step 2: Convert to fraction form
    430.66/645.76 = 170.61/x
  3. Step 3: Cross multiply
    430.66x = 645.76 × 170.61
  4. Step 4: Simplify right side
    430.66x = 110,173.11
  5. Step 5: Solve for x
    x = 110,173.11/430.66
  6. Step 6: Final answer
    x = 255.82

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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.