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Finding the Fourth Proportional to 86.42, 119.07 and 64.55

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Solution

The fourth proportional to 86.42, 119.07 and 64.55 is: 88.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.42 : 119.07 = 64.55 : x
  2. Step 2: Convert to fraction form
    86.42/119.07 = 64.55/x
  3. Step 3: Cross multiply
    86.42x = 119.07 × 64.55
  4. Step 4: Simplify right side
    86.42x = 7,686.27
  5. Step 5: Solve for x
    x = 7,686.27/86.42
  6. Step 6: Final answer
    x = 88.94

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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.