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Finding the Fourth Proportional to 443.92, 665.28 and 430.78

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Solution

The fourth proportional to 443.92, 665.28 and 430.78 is: 645.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.92 : 665.28 = 430.78 : x
  2. Step 2: Convert to fraction form
    443.92/665.28 = 430.78/x
  3. Step 3: Cross multiply
    443.92x = 665.28 × 430.78
  4. Step 4: Simplify right side
    443.92x = 286,589.32
  5. Step 5: Solve for x
    x = 286,589.32/443.92
  6. Step 6: Final answer
    x = 645.59

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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.