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Finding the Fourth Proportional to 64.22, 88.58 and 39.68

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Solution

The fourth proportional to 64.22, 88.58 and 39.68 is: 54.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.22 : 88.58 = 39.68 : x
  2. Step 2: Convert to fraction form
    64.22/88.58 = 39.68/x
  3. Step 3: Cross multiply
    64.22x = 88.58 × 39.68
  4. Step 4: Simplify right side
    64.22x = 3,514.51
  5. Step 5: Solve for x
    x = 3,514.51/64.22
  6. Step 6: Final answer
    x = 54.72

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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.