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Finding the Fourth Proportional to 64.55, 88.94 and 55.31

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Solution

The fourth proportional to 64.55, 88.94 and 55.31 is: 76.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.55 : 88.94 = 55.31 : x
  2. Step 2: Convert to fraction form
    64.55/88.94 = 55.31/x
  3. Step 3: Cross multiply
    64.55x = 88.94 × 55.31
  4. Step 4: Simplify right side
    64.55x = 4,918.55
  5. Step 5: Solve for x
    x = 4,918.55/64.55
  6. Step 6: Final answer
    x = 76.20

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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.