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Finding the Fourth Proportional to 260.36, 390.57 and 77.77

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Solution

The fourth proportional to 260.36, 390.57 and 77.77 is: 116.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.36 : 390.57 = 77.77 : x
  2. Step 2: Convert to fraction form
    260.36/390.57 = 77.77/x
  3. Step 3: Cross multiply
    260.36x = 390.57 × 77.77
  4. Step 4: Simplify right side
    260.36x = 30,372.29
  5. Step 5: Solve for x
    x = 30,372.29/260.36
  6. Step 6: Final answer
    x = 116.66

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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.