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Finding the Fourth Proportional to 94.16, 129.86 and 61.40

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Solution

The fourth proportional to 94.16, 129.86 and 61.40 is: 84.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.16 : 129.86 = 61.40 : x
  2. Step 2: Convert to fraction form
    94.16/129.86 = 61.40/x
  3. Step 3: Cross multiply
    94.16x = 129.86 × 61.40
  4. Step 4: Simplify right side
    94.16x = 7,973.40
  5. Step 5: Solve for x
    x = 7,973.40/94.16
  6. Step 6: Final answer
    x = 84.68

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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.