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Finding the Fourth Proportional to 103.19, 142.40 and 59.54

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Solution

The fourth proportional to 103.19, 142.40 and 59.54 is: 82.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.19 : 142.40 = 59.54 : x
  2. Step 2: Convert to fraction form
    103.19/142.40 = 59.54/x
  3. Step 3: Cross multiply
    103.19x = 142.40 × 59.54
  4. Step 4: Simplify right side
    103.19x = 8,477.93
  5. Step 5: Solve for x
    x = 8,477.93/103.19
  6. Step 6: Final answer
    x = 82.16

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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.