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Finding the Fourth Proportional to 977.74, 1,349.28 and 584.77

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Solution

The fourth proportional to 977.74, 1,349.28 and 584.77 is: 806.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.74 : 1,349.28 = 584.77 : x
  2. Step 2: Convert to fraction form
    977.74/1,349.28 = 584.77/x
  3. Step 3: Cross multiply
    977.74x = 1,349.28 × 584.77
  4. Step 4: Simplify right side
    977.74x = 789,015.03
  5. Step 5: Solve for x
    x = 789,015.03/977.74
  6. Step 6: Final answer
    x = 806.98

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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.