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Finding the Fourth Proportional to 64.19, 88.54 and 39.62

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Solution

The fourth proportional to 64.19, 88.54 and 39.62 is: 54.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.19 : 88.54 = 39.62 : x
  2. Step 2: Convert to fraction form
    64.19/88.54 = 39.62/x
  3. Step 3: Cross multiply
    64.19x = 88.54 × 39.62
  4. Step 4: Simplify right side
    64.19x = 3,507.95
  5. Step 5: Solve for x
    x = 3,507.95/64.19
  6. Step 6: Final answer
    x = 54.65

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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.