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Finding the Fourth Proportional to 215.21, 322.70 and 146.81

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Solution

The fourth proportional to 215.21, 322.70 and 146.81 is: 220.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.21 : 322.70 = 146.81 : x
  2. Step 2: Convert to fraction form
    215.21/322.70 = 146.81/x
  3. Step 3: Cross multiply
    215.21x = 322.70 × 146.81
  4. Step 4: Simplify right side
    215.21x = 47,376.49
  5. Step 5: Solve for x
    x = 47,376.49/215.21
  6. Step 6: Final answer
    x = 220.14

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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.