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Finding the Fourth Proportional to 890.85, 1,228.72 and 772.62

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Solution

The fourth proportional to 890.85, 1,228.72 and 772.62 is: 1,065.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.85 : 1,228.72 = 772.62 : x
  2. Step 2: Convert to fraction form
    890.85/1,228.72 = 772.62/x
  3. Step 3: Cross multiply
    890.85x = 1,228.72 × 772.62
  4. Step 4: Simplify right side
    890.85x = 949,333.65
  5. Step 5: Solve for x
    x = 949,333.65/890.85
  6. Step 6: Final answer
    x = 1,065.65

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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.