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Finding the Fourth Proportional to 102.93, 142.08 and 70.17

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Solution

The fourth proportional to 102.93, 142.08 and 70.17 is: 96.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.93 : 142.08 = 70.17 : x
  2. Step 2: Convert to fraction form
    102.93/142.08 = 70.17/x
  3. Step 3: Cross multiply
    102.93x = 142.08 × 70.17
  4. Step 4: Simplify right side
    102.93x = 9,969.75
  5. Step 5: Solve for x
    x = 9,969.75/102.93
  6. Step 6: Final answer
    x = 96.86

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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.