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Finding the Fourth Proportional to 64.21, 88.68 and 55.50

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Solution

The fourth proportional to 64.21, 88.68 and 55.50 is: 76.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.21 : 88.68 = 55.50 : x
  2. Step 2: Convert to fraction form
    64.21/88.68 = 55.50/x
  3. Step 3: Cross multiply
    64.21x = 88.68 × 55.50
  4. Step 4: Simplify right side
    64.21x = 4,921.74
  5. Step 5: Solve for x
    x = 4,921.74/64.21
  6. Step 6: Final answer
    x = 76.65

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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.