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Finding the Fourth Proportional to 94.06, 129.60 and 64.90

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Solution

The fourth proportional to 94.06, 129.60 and 64.90 is: 89.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.06 : 129.60 = 64.90 : x
  2. Step 2: Convert to fraction form
    94.06/129.60 = 64.90/x
  3. Step 3: Cross multiply
    94.06x = 129.60 × 64.90
  4. Step 4: Simplify right side
    94.06x = 8,411.04
  5. Step 5: Solve for x
    x = 8,411.04/94.06
  6. Step 6: Final answer
    x = 89.42

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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.