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Finding the Fourth Proportional to 776.56, 1,164.72 and 314.56

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Solution

The fourth proportional to 776.56, 1,164.72 and 314.56 is: 471.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.56 : 1,164.72 = 314.56 : x
  2. Step 2: Convert to fraction form
    776.56/1,164.72 = 314.56/x
  3. Step 3: Cross multiply
    776.56x = 1,164.72 × 314.56
  4. Step 4: Simplify right side
    776.56x = 366,374.32
  5. Step 5: Solve for x
    x = 366,374.32/776.56
  6. Step 6: Final answer
    x = 471.79

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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.