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Finding the Fourth Proportional to 102.57, 141.57 and 65.79

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Solution

The fourth proportional to 102.57, 141.57 and 65.79 is: 90.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.57 : 141.57 = 65.79 : x
  2. Step 2: Convert to fraction form
    102.57/141.57 = 65.79/x
  3. Step 3: Cross multiply
    102.57x = 141.57 × 65.79
  4. Step 4: Simplify right side
    102.57x = 9,313.89
  5. Step 5: Solve for x
    x = 9,313.89/102.57
  6. Step 6: Final answer
    x = 90.81

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.