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Finding the Fourth Proportional to 64.10, 88.40 and 54.88

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Solution

The fourth proportional to 64.10, 88.40 and 54.88 is: 75.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.10 : 88.40 = 54.88 : x
  2. Step 2: Convert to fraction form
    64.10/88.40 = 54.88/x
  3. Step 3: Cross multiply
    64.10x = 88.40 × 54.88
  4. Step 4: Simplify right side
    64.10x = 4,851.39
  5. Step 5: Solve for x
    x = 4,851.39/64.10
  6. Step 6: Final answer
    x = 75.68

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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.