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Finding the Fourth Proportional to 215.54, 322.91 and 145.98

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Solution

The fourth proportional to 215.54, 322.91 and 145.98 is: 218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.54 : 322.91 = 145.98 : x
  2. Step 2: Convert to fraction form
    215.54/322.91 = 145.98/x
  3. Step 3: Cross multiply
    215.54x = 322.91 × 145.98
  4. Step 4: Simplify right side
    215.54x = 47,138.40
  5. Step 5: Solve for x
    x = 47,138.40/215.54
  6. Step 6: Final answer
    x = 218.70

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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.