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Finding the Fourth Proportional to 105.13, 157.38 and 64.43

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Solution

The fourth proportional to 105.13, 157.38 and 64.43 is: 96.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.13 : 157.38 = 64.43 : x
  2. Step 2: Convert to fraction form
    105.13/157.38 = 64.43/x
  3. Step 3: Cross multiply
    105.13x = 157.38 × 64.43
  4. Step 4: Simplify right side
    105.13x = 10,139.99
  5. Step 5: Solve for x
    x = 10,139.99/105.13
  6. Step 6: Final answer
    x = 96.45

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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.