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Finding the Fourth Proportional to 64.10, 88.38 and 55.34

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Solution

The fourth proportional to 64.10, 88.38 and 55.34 is: 76.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.10 : 88.38 = 55.34 : x
  2. Step 2: Convert to fraction form
    64.10/88.38 = 55.34/x
  3. Step 3: Cross multiply
    64.10x = 88.38 × 55.34
  4. Step 4: Simplify right side
    64.10x = 4,890.95
  5. Step 5: Solve for x
    x = 4,890.95/64.10
  6. Step 6: Final answer
    x = 76.30

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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.