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Finding the Fourth Proportional to 215.69, 297.72 and 153.86

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Solution

The fourth proportional to 215.69, 297.72 and 153.86 is: 212.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.69 : 297.72 = 153.86 : x
  2. Step 2: Convert to fraction form
    215.69/297.72 = 153.86/x
  3. Step 3: Cross multiply
    215.69x = 297.72 × 153.86
  4. Step 4: Simplify right side
    215.69x = 45,805.71
  5. Step 5: Solve for x
    x = 45,805.71/215.69
  6. Step 6: Final answer
    x = 212.37

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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.