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Finding the Fourth Proportional to 105.69, 158.68 and 64.99

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Solution

The fourth proportional to 105.69, 158.68 and 64.99 is: 97.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.69 : 158.68 = 64.99 : x
  2. Step 2: Convert to fraction form
    105.69/158.68 = 64.99/x
  3. Step 3: Cross multiply
    105.69x = 158.68 × 64.99
  4. Step 4: Simplify right side
    105.69x = 10,312.61
  5. Step 5: Solve for x
    x = 10,312.61/105.69
  6. Step 6: Final answer
    x = 97.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.