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Finding the Fourth Proportional to 215.90, 297.95 and 117.66

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Solution

The fourth proportional to 215.90, 297.95 and 117.66 is: 162.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.90 : 297.95 = 117.66 : x
  2. Step 2: Convert to fraction form
    215.90/297.95 = 117.66/x
  3. Step 3: Cross multiply
    215.90x = 297.95 × 117.66
  4. Step 4: Simplify right side
    215.90x = 35,056.49
  5. Step 5: Solve for x
    x = 35,056.49/215.90
  6. Step 6: Final answer
    x = 162.37

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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.