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Finding the Fourth Proportional to 103.89, 143.39 and 62.45

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Solution

The fourth proportional to 103.89, 143.39 and 62.45 is: 86.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.89 : 143.39 = 62.45 : x
  2. Step 2: Convert to fraction form
    103.89/143.39 = 62.45/x
  3. Step 3: Cross multiply
    103.89x = 143.39 × 62.45
  4. Step 4: Simplify right side
    103.89x = 8,954.71
  5. Step 5: Solve for x
    x = 8,954.71/103.89
  6. Step 6: Final answer
    x = 86.19

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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.