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Finding the Fourth Proportional to 58.10, 86.76 and 54.68

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Solution

The fourth proportional to 58.10, 86.76 and 54.68 is: 81.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.10 : 86.76 = 54.68 : x
  2. Step 2: Convert to fraction form
    58.10/86.76 = 54.68/x
  3. Step 3: Cross multiply
    58.10x = 86.76 × 54.68
  4. Step 4: Simplify right side
    58.10x = 4,743.60
  5. Step 5: Solve for x
    x = 4,743.60/58.10
  6. Step 6: Final answer
    x = 81.65

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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.