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Finding the Fourth Proportional to 111.32, 153.62 and 64.70

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Solution

The fourth proportional to 111.32, 153.62 and 64.70 is: 89.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.32 : 153.62 = 64.70 : x
  2. Step 2: Convert to fraction form
    111.32/153.62 = 64.70/x
  3. Step 3: Cross multiply
    111.32x = 153.62 × 64.70
  4. Step 4: Simplify right side
    111.32x = 9,938.12
  5. Step 5: Solve for x
    x = 9,938.12/111.32
  6. Step 6: Final answer
    x = 89.28

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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.