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Finding the Fourth Proportional to 64, 88.35 and 61.72

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Solution

The fourth proportional to 64, 88.35 and 61.72 is: 85.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    64 : 88.35 = 61.72 : x
  2. Step 2: Convert to fraction form
    64/88.35 = 61.72/x
  3. Step 3: Cross multiply
    64x = 88.35 × 61.72
  4. Step 4: Simplify right side
    64x = 5,452.96
  5. Step 5: Solve for x
    x = 5,452.96/64
  6. Step 6: Final answer
    x = 85.20

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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.