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Finding the Fourth Proportional to 64.74, 96.90 and 55.60

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Solution

The fourth proportional to 64.74, 96.90 and 55.60 is: 83.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.74 : 96.90 = 55.60 : x
  2. Step 2: Convert to fraction form
    64.74/96.90 = 55.60/x
  3. Step 3: Cross multiply
    64.74x = 96.90 × 55.60
  4. Step 4: Simplify right side
    64.74x = 5,387.64
  5. Step 5: Solve for x
    x = 5,387.64/64.74
  6. Step 6: Final answer
    x = 83.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.