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Finding the Fourth Proportional to 94.02, 129.78 and 64.95

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Solution

The fourth proportional to 94.02, 129.78 and 64.95 is: 89.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.02 : 129.78 = 64.95 : x
  2. Step 2: Convert to fraction form
    94.02/129.78 = 64.95/x
  3. Step 3: Cross multiply
    94.02x = 129.78 × 64.95
  4. Step 4: Simplify right side
    94.02x = 8,429.21
  5. Step 5: Solve for x
    x = 8,429.21/94.02
  6. Step 6: Final answer
    x = 89.65

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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.