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Finding the Fourth Proportional to 215.93, 297.99 and 128.63

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Solution

The fourth proportional to 215.93, 297.99 and 128.63 is: 177.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.93 : 297.99 = 128.63 : x
  2. Step 2: Convert to fraction form
    215.93/297.99 = 128.63/x
  3. Step 3: Cross multiply
    215.93x = 297.99 × 128.63
  4. Step 4: Simplify right side
    215.93x = 38,330.45
  5. Step 5: Solve for x
    x = 38,330.45/215.93
  6. Step 6: Final answer
    x = 177.51

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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.