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Finding the Fourth Proportional to 447.12, 667.95 and 430.92

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Solution

The fourth proportional to 447.12, 667.95 and 430.92 is: 643.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.12 : 667.95 = 430.92 : x
  2. Step 2: Convert to fraction form
    447.12/667.95 = 430.92/x
  3. Step 3: Cross multiply
    447.12x = 667.95 × 430.92
  4. Step 4: Simplify right side
    447.12x = 287,831.40
  5. Step 5: Solve for x
    x = 287,831.40/447.12
  6. Step 6: Final answer
    x = 643.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.