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Finding the Fourth Proportional to 58.01, 79.87 and 49.78

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Solution

The fourth proportional to 58.01, 79.87 and 49.78 is: 68.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.01 : 79.87 = 49.78 : x
  2. Step 2: Convert to fraction form
    58.01/79.87 = 49.78/x
  3. Step 3: Cross multiply
    58.01x = 79.87 × 49.78
  4. Step 4: Simplify right side
    58.01x = 3,975.93
  5. Step 5: Solve for x
    x = 3,975.93/58.01
  6. Step 6: Final answer
    x = 68.54

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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.