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Finding the Fourth Proportional to 777.18, 1,165.82 and 257.21

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Solution

The fourth proportional to 777.18, 1,165.82 and 257.21 is: 385.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.18 : 1,165.82 = 257.21 : x
  2. Step 2: Convert to fraction form
    777.18/1,165.82 = 257.21/x
  3. Step 3: Cross multiply
    777.18x = 1,165.82 × 257.21
  4. Step 4: Simplify right side
    777.18x = 299,853.45
  5. Step 5: Solve for x
    x = 299,853.45/777.18
  6. Step 6: Final answer
    x = 385.82

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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.