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Finding the Fourth Proportional to 53.31, 79.45 and 52.88

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Solution

The fourth proportional to 53.31, 79.45 and 52.88 is: 78.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.31 : 79.45 = 52.88 : x
  2. Step 2: Convert to fraction form
    53.31/79.45 = 52.88/x
  3. Step 3: Cross multiply
    53.31x = 79.45 × 52.88
  4. Step 4: Simplify right side
    53.31x = 4,201.32
  5. Step 5: Solve for x
    x = 4,201.32/53.31
  6. Step 6: Final answer
    x = 78.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.