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Finding the Fourth Proportional to 434.40, 651.81 and 218.13

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Solution

The fourth proportional to 434.40, 651.81 and 218.13 is: 327.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.40 : 651.81 = 218.13 : x
  2. Step 2: Convert to fraction form
    434.40/651.81 = 218.13/x
  3. Step 3: Cross multiply
    434.40x = 651.81 × 218.13
  4. Step 4: Simplify right side
    434.40x = 142,179.32
  5. Step 5: Solve for x
    x = 142,179.32/434.40
  6. Step 6: Final answer
    x = 327.30

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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.