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Finding the Fourth Proportional to 776.50, 1,164.59 and 256.56

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Solution

The fourth proportional to 776.50, 1,164.59 and 256.56 is: 384.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.50 : 1,164.59 = 256.56 : x
  2. Step 2: Convert to fraction form
    776.50/1,164.59 = 256.56/x
  3. Step 3: Cross multiply
    776.50x = 1,164.59 × 256.56
  4. Step 4: Simplify right side
    776.50x = 298,782.52
  5. Step 5: Solve for x
    x = 298,782.52/776.50
  6. Step 6: Final answer
    x = 384.78

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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.