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Finding the Fourth Proportional to 977.66, 1,349.06 and 779

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Solution

The fourth proportional to 977.66, 1,349.06 and 779 is: 1,074.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.66 : 1,349.06 = 779 : x
  2. Step 2: Convert to fraction form
    977.66/1,349.06 = 779/x
  3. Step 3: Cross multiply
    977.66x = 1,349.06 × 779
  4. Step 4: Simplify right side
    977.66x = 1,050,917.74
  5. Step 5: Solve for x
    x = 1,050,917.74/977.66
  6. Step 6: Final answer
    x = 1,074.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.