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Finding the Fourth Proportional to 218.32, 300.88 and 156.15

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Solution

The fourth proportional to 218.32, 300.88 and 156.15 is: 215.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.32 : 300.88 = 156.15 : x
  2. Step 2: Convert to fraction form
    218.32/300.88 = 156.15/x
  3. Step 3: Cross multiply
    218.32x = 300.88 × 156.15
  4. Step 4: Simplify right side
    218.32x = 46,982.61
  5. Step 5: Solve for x
    x = 46,982.61/218.32
  6. Step 6: Final answer
    x = 215.20

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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.