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Finding the Fourth Proportional to 58.40, 86.85 and 57.79

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Solution

The fourth proportional to 58.40, 86.85 and 57.79 is: 85.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.40 : 86.85 = 57.79 : x
  2. Step 2: Convert to fraction form
    58.40/86.85 = 57.79/x
  3. Step 3: Cross multiply
    58.40x = 86.85 × 57.79
  4. Step 4: Simplify right side
    58.40x = 5,019.06
  5. Step 5: Solve for x
    x = 5,019.06/58.40
  6. Step 6: Final answer
    x = 85.94

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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.