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Finding the Fourth Proportional to 71.52, 98.64 and 58.56

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Solution

The fourth proportional to 71.52, 98.64 and 58.56 is: 80.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.52 : 98.64 = 58.56 : x
  2. Step 2: Convert to fraction form
    71.52/98.64 = 58.56/x
  3. Step 3: Cross multiply
    71.52x = 98.64 × 58.56
  4. Step 4: Simplify right side
    71.52x = 5,776.36
  5. Step 5: Solve for x
    x = 5,776.36/71.52
  6. Step 6: Final answer
    x = 80.77

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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.