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Finding the Fourth Proportional to 216.59, 298.72 and 154.40

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Solution

The fourth proportional to 216.59, 298.72 and 154.40 is: 212.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.59 : 298.72 = 154.40 : x
  2. Step 2: Convert to fraction form
    216.59/298.72 = 154.40/x
  3. Step 3: Cross multiply
    216.59x = 298.72 × 154.40
  4. Step 4: Simplify right side
    216.59x = 46,122.21
  5. Step 5: Solve for x
    x = 46,122.21/216.59
  6. Step 6: Final answer
    x = 212.94

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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.