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Finding the Fourth Proportional to 215.61, 297.40 and 128.26

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Solution

The fourth proportional to 215.61, 297.40 and 128.26 is: 176.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.61 : 297.40 = 128.26 : x
  2. Step 2: Convert to fraction form
    215.61/297.40 = 128.26/x
  3. Step 3: Cross multiply
    215.61x = 297.40 × 128.26
  4. Step 4: Simplify right side
    215.61x = 38,144.52
  5. Step 5: Solve for x
    x = 38,144.52/215.61
  6. Step 6: Final answer
    x = 176.91

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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.