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Finding the Fourth Proportional to 104, 143.48 and 64.66

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Solution

The fourth proportional to 104, 143.48 and 64.66 is: 89.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    104 : 143.48 = 64.66 : x
  2. Step 2: Convert to fraction form
    104/143.48 = 64.66/x
  3. Step 3: Cross multiply
    104x = 143.48 × 64.66
  4. Step 4: Simplify right side
    104x = 9,277.42
  5. Step 5: Solve for x
    x = 9,277.42/104
  6. Step 6: Final answer
    x = 89.21

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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.