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Finding the Fourth Proportional to 777.79, 1,166.41 and 257.70

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Solution

The fourth proportional to 777.79, 1,166.41 and 257.70 is: 386.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.79 : 1,166.41 = 257.70 : x
  2. Step 2: Convert to fraction form
    777.79/1,166.41 = 257.70/x
  3. Step 3: Cross multiply
    777.79x = 1,166.41 × 257.70
  4. Step 4: Simplify right side
    777.79x = 300,583.86
  5. Step 5: Solve for x
    x = 300,583.86/777.79
  6. Step 6: Final answer
    x = 386.46

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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.