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Finding the Fourth Proportional to 58.56, 81.28 and 58.56

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Solution

The fourth proportional to 58.56, 81.28 and 58.56 is: 81.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.56 : 81.28 = 58.56 : x
  2. Step 2: Convert to fraction form
    58.56/81.28 = 58.56/x
  3. Step 3: Cross multiply
    58.56x = 81.28 × 58.56
  4. Step 4: Simplify right side
    58.56x = 4,759.76
  5. Step 5: Solve for x
    x = 4,759.76/58.56
  6. Step 6: Final answer
    x = 81.28

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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.