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Finding the Fourth Proportional to 434.02, 651.36 and 217.78

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Solution

The fourth proportional to 434.02, 651.36 and 217.78 is: 326.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.02 : 651.36 = 217.78 : x
  2. Step 2: Convert to fraction form
    434.02/651.36 = 217.78/x
  3. Step 3: Cross multiply
    434.02x = 651.36 × 217.78
  4. Step 4: Simplify right side
    434.02x = 141,853.18
  5. Step 5: Solve for x
    x = 141,853.18/434.02
  6. Step 6: Final answer
    x = 326.84

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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.