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Finding the Fourth Proportional to 215.55, 322.92 and 143.26

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Solution

The fourth proportional to 215.55, 322.92 and 143.26 is: 214.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.55 : 322.92 = 143.26 : x
  2. Step 2: Convert to fraction form
    215.55/322.92 = 143.26/x
  3. Step 3: Cross multiply
    215.55x = 322.92 × 143.26
  4. Step 4: Simplify right side
    215.55x = 46,260.71
  5. Step 5: Solve for x
    x = 46,260.71/215.55
  6. Step 6: Final answer
    x = 214.62

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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.