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Finding the Fourth Proportional to 64.48, 88.89 and 55.70

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Solution

The fourth proportional to 64.48, 88.89 and 55.70 is: 76.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.48 : 88.89 = 55.70 : x
  2. Step 2: Convert to fraction form
    64.48/88.89 = 55.70/x
  3. Step 3: Cross multiply
    64.48x = 88.89 × 55.70
  4. Step 4: Simplify right side
    64.48x = 4,951.17
  5. Step 5: Solve for x
    x = 4,951.17/64.48
  6. Step 6: Final answer
    x = 76.79

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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.