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Finding the Fourth Proportional to 215.87, 322.98 and 143.39

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Solution

The fourth proportional to 215.87, 322.98 and 143.39 is: 214.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.87 : 322.98 = 143.39 : x
  2. Step 2: Convert to fraction form
    215.87/322.98 = 143.39/x
  3. Step 3: Cross multiply
    215.87x = 322.98 × 143.39
  4. Step 4: Simplify right side
    215.87x = 46,312.10
  5. Step 5: Solve for x
    x = 46,312.10/215.87
  6. Step 6: Final answer
    x = 214.54

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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.