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Finding the Fourth Proportional to 430.17, 645.26 and 105.54

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Solution

The fourth proportional to 430.17, 645.26 and 105.54 is: 158.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.17 : 645.26 = 105.54 : x
  2. Step 2: Convert to fraction form
    430.17/645.26 = 105.54/x
  3. Step 3: Cross multiply
    430.17x = 645.26 × 105.54
  4. Step 4: Simplify right side
    430.17x = 68,096.99
  5. Step 5: Solve for x
    x = 68,096.99/430.17
  6. Step 6: Final answer
    x = 158.30

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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.