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Finding the Fourth Proportional to 776.80, 1,164.45 and 314.47

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Solution

The fourth proportional to 776.80, 1,164.45 and 314.47 is: 471.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.80 : 1,164.45 = 314.47 : x
  2. Step 2: Convert to fraction form
    776.80/1,164.45 = 314.47/x
  3. Step 3: Cross multiply
    776.80x = 1,164.45 × 314.47
  4. Step 4: Simplify right side
    776.80x = 366,184.59
  5. Step 5: Solve for x
    x = 366,184.59/776.80
  6. Step 6: Final answer
    x = 471.40

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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.