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Finding the Fourth Proportional to 111.38, 153.71 and 64.74

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Solution

The fourth proportional to 111.38, 153.71 and 64.74 is: 89.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.38 : 153.71 = 64.74 : x
  2. Step 2: Convert to fraction form
    111.38/153.71 = 64.74/x
  3. Step 3: Cross multiply
    111.38x = 153.71 × 64.74
  4. Step 4: Simplify right side
    111.38x = 9,950.80
  5. Step 5: Solve for x
    x = 9,950.80/111.38
  6. Step 6: Final answer
    x = 89.35

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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.