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Finding the Fourth Proportional to 430.67, 645.15 and 308.54

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Solution

The fourth proportional to 430.67, 645.15 and 308.54 is: 462.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.67 : 645.15 = 308.54 : x
  2. Step 2: Convert to fraction form
    430.67/645.15 = 308.54/x
  3. Step 3: Cross multiply
    430.67x = 645.15 × 308.54
  4. Step 4: Simplify right side
    430.67x = 199,054.58
  5. Step 5: Solve for x
    x = 199,054.58/430.67
  6. Step 6: Final answer
    x = 462.20

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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.