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Finding the Fourth Proportional to 1,050.85, 1,576.28 and 640.79

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Solution

The fourth proportional to 1,050.85, 1,576.28 and 640.79 is: 961.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,050.85 : 1,576.28 = 640.79 : x
  2. Step 2: Convert to fraction form
    1,050.85/1,576.28 = 640.79/x
  3. Step 3: Cross multiply
    1,050.85x = 1,576.28 × 640.79
  4. Step 4: Simplify right side
    1,050.85x = 1,010,064.46
  5. Step 5: Solve for x
    x = 1,010,064.46/1,050.85
  6. Step 6: Final answer
    x = 961.19

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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.