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Finding the Fourth Proportional to 776.40, 1,164.78 and 228.57

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Solution

The fourth proportional to 776.40, 1,164.78 and 228.57 is: 342.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.40 : 1,164.78 = 228.57 : x
  2. Step 2: Convert to fraction form
    776.40/1,164.78 = 228.57/x
  3. Step 3: Cross multiply
    776.40x = 1,164.78 × 228.57
  4. Step 4: Simplify right side
    776.40x = 266,233.76
  5. Step 5: Solve for x
    x = 266,233.76/776.40
  6. Step 6: Final answer
    x = 342.91

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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.