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Finding the Fourth Proportional to 298.19, 411.50 and 165.40

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Solution

The fourth proportional to 298.19, 411.50 and 165.40 is: 228.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.19 : 411.50 = 165.40 : x
  2. Step 2: Convert to fraction form
    298.19/411.50 = 165.40/x
  3. Step 3: Cross multiply
    298.19x = 411.50 × 165.40
  4. Step 4: Simplify right side
    298.19x = 68,061.48
  5. Step 5: Solve for x
    x = 68,061.48/298.19
  6. Step 6: Final answer
    x = 228.25

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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.