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Finding the Fourth Proportional to 104.28, 143.90 and 64.95

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Solution

The fourth proportional to 104.28, 143.90 and 64.95 is: 89.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.28 : 143.90 = 64.95 : x
  2. Step 2: Convert to fraction form
    104.28/143.90 = 64.95/x
  3. Step 3: Cross multiply
    104.28x = 143.90 × 64.95
  4. Step 4: Simplify right side
    104.28x = 9,345.93
  5. Step 5: Solve for x
    x = 9,345.93/104.28
  6. Step 6: Final answer
    x = 89.62

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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.