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Finding the Fourth Proportional to 266.15, 398.95 and 128.93

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Solution

The fourth proportional to 266.15, 398.95 and 128.93 is: 193.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.15 : 398.95 = 128.93 : x
  2. Step 2: Convert to fraction form
    266.15/398.95 = 128.93/x
  3. Step 3: Cross multiply
    266.15x = 398.95 × 128.93
  4. Step 4: Simplify right side
    266.15x = 51,434.31
  5. Step 5: Solve for x
    x = 51,434.31/266.15
  6. Step 6: Final answer
    x = 193.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.