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Finding the Fourth Proportional to 103.21, 141.62 and 93.93

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Solution

The fourth proportional to 103.21, 141.62 and 93.93 is: 128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.21 : 141.62 = 93.93 : x
  2. Step 2: Convert to fraction form
    103.21/141.62 = 93.93/x
  3. Step 3: Cross multiply
    103.21x = 141.62 × 93.93
  4. Step 4: Simplify right side
    103.21x = 13,302.16
  5. Step 5: Solve for x
    x = 13,302.16/103.21
  6. Step 6: Final answer
    x = 128.89

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.