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Finding the Fourth Proportional to 58.52, 81.20 and 57.31

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Solution

The fourth proportional to 58.52, 81.20 and 57.31 is: 79.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.52 : 81.20 = 57.31 : x
  2. Step 2: Convert to fraction form
    58.52/81.20 = 57.31/x
  3. Step 3: Cross multiply
    58.52x = 81.20 × 57.31
  4. Step 4: Simplify right side
    58.52x = 4,653.51
  5. Step 5: Solve for x
    x = 4,653.51/58.52
  6. Step 6: Final answer
    x = 79.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.