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Finding the Fourth Proportional to 103.70, 143.11 and 70.93

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Solution

The fourth proportional to 103.70, 143.11 and 70.93 is: 97.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.70 : 143.11 = 70.93 : x
  2. Step 2: Convert to fraction form
    103.70/143.11 = 70.93/x
  3. Step 3: Cross multiply
    103.70x = 143.11 × 70.93
  4. Step 4: Simplify right side
    103.70x = 10,150.79
  5. Step 5: Solve for x
    x = 10,150.79/103.70
  6. Step 6: Final answer
    x = 97.89

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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.