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Finding the Fourth Proportional to 215.43, 297.36 and 153.40

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Solution

The fourth proportional to 215.43, 297.36 and 153.40 is: 211.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.43 : 297.36 = 153.40 : x
  2. Step 2: Convert to fraction form
    215.43/297.36 = 153.40/x
  3. Step 3: Cross multiply
    215.43x = 297.36 × 153.40
  4. Step 4: Simplify right side
    215.43x = 45,612.77
  5. Step 5: Solve for x
    x = 45,612.77/215.43
  6. Step 6: Final answer
    x = 211.73

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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.