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Finding the Fourth Proportional to 216.58, 298.89 and 145.78

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Solution

The fourth proportional to 216.58, 298.89 and 145.78 is: 201.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.58 : 298.89 = 145.78 : x
  2. Step 2: Convert to fraction form
    216.58/298.89 = 145.78/x
  3. Step 3: Cross multiply
    216.58x = 298.89 × 145.78
  4. Step 4: Simplify right side
    216.58x = 43,572.18
  5. Step 5: Solve for x
    x = 43,572.18/216.58
  6. Step 6: Final answer
    x = 201.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.