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Finding the Fourth Proportional to 215.83, 297.92 and 128.50

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Solution

The fourth proportional to 215.83, 297.92 and 128.50 is: 177.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.83 : 297.92 = 128.50 : x
  2. Step 2: Convert to fraction form
    215.83/297.92 = 128.50/x
  3. Step 3: Cross multiply
    215.83x = 297.92 × 128.50
  4. Step 4: Simplify right side
    215.83x = 38,282.72
  5. Step 5: Solve for x
    x = 38,282.72/215.83
  6. Step 6: Final answer
    x = 177.37

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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.