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Finding the Fourth Proportional to 969.77, 1,337.72 and 620.46

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Solution

The fourth proportional to 969.77, 1,337.72 and 620.46 is: 855.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.77 : 1,337.72 = 620.46 : x
  2. Step 2: Convert to fraction form
    969.77/1,337.72 = 620.46/x
  3. Step 3: Cross multiply
    969.77x = 1,337.72 × 620.46
  4. Step 4: Simplify right side
    969.77x = 829,998.65
  5. Step 5: Solve for x
    x = 829,998.65/969.77
  6. Step 6: Final answer
    x = 855.87

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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.