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Finding the Fourth Proportional to 64.11, 88.40 and 58.91

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Solution

The fourth proportional to 64.11, 88.40 and 58.91 is: 81.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.11 : 88.40 = 58.91 : x
  2. Step 2: Convert to fraction form
    64.11/88.40 = 58.91/x
  3. Step 3: Cross multiply
    64.11x = 88.40 × 58.91
  4. Step 4: Simplify right side
    64.11x = 5,207.18
  5. Step 5: Solve for x
    x = 5,207.18/64.11
  6. Step 6: Final answer
    x = 81.23

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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.