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Finding the Fourth Proportional to 111.21, 153.45 and 64.58

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Solution

The fourth proportional to 111.21, 153.45 and 64.58 is: 89.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.21 : 153.45 = 64.58 : x
  2. Step 2: Convert to fraction form
    111.21/153.45 = 64.58/x
  3. Step 3: Cross multiply
    111.21x = 153.45 × 64.58
  4. Step 4: Simplify right side
    111.21x = 9,909.80
  5. Step 5: Solve for x
    x = 9,909.80/111.21
  6. Step 6: Final answer
    x = 89.11

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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.