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Finding the Fourth Proportional to 247.15, 340.71 and 153.87

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Solution

The fourth proportional to 247.15, 340.71 and 153.87 is: 212.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.15 : 340.71 = 153.87 : x
  2. Step 2: Convert to fraction form
    247.15/340.71 = 153.87/x
  3. Step 3: Cross multiply
    247.15x = 340.71 × 153.87
  4. Step 4: Simplify right side
    247.15x = 52,423.19
  5. Step 5: Solve for x
    x = 52,423.19/247.15
  6. Step 6: Final answer
    x = 212.11

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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.