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Finding the Fourth Proportional to 258.08, 387.13 and 84.77

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Solution

The fourth proportional to 258.08, 387.13 and 84.77 is: 127.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.08 : 387.13 = 84.77 : x
  2. Step 2: Convert to fraction form
    258.08/387.13 = 84.77/x
  3. Step 3: Cross multiply
    258.08x = 387.13 × 84.77
  4. Step 4: Simplify right side
    258.08x = 32,817.77
  5. Step 5: Solve for x
    x = 32,817.77/258.08
  6. Step 6: Final answer
    x = 127.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.