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Finding the Fourth Proportional to 430.33, 645.49 and 105.70

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Solution

The fourth proportional to 430.33, 645.49 and 105.70 is: 158.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.33 : 645.49 = 105.70 : x
  2. Step 2: Convert to fraction form
    430.33/645.49 = 105.70/x
  3. Step 3: Cross multiply
    430.33x = 645.49 × 105.70
  4. Step 4: Simplify right side
    430.33x = 68,228.29
  5. Step 5: Solve for x
    x = 68,228.29/430.33
  6. Step 6: Final answer
    x = 158.55

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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.