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Finding the Fourth Proportional to 1,262.45, 1,890.19 and 644.83

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Solution

The fourth proportional to 1,262.45, 1,890.19 and 644.83 is: 965.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.45 : 1,890.19 = 644.83 : x
  2. Step 2: Convert to fraction form
    1,262.45/1,890.19 = 644.83/x
  3. Step 3: Cross multiply
    1,262.45x = 1,890.19 × 644.83
  4. Step 4: Simplify right side
    1,262.45x = 1,218,843.67
  5. Step 5: Solve for x
    x = 1,218,843.67/1,262.45
  6. Step 6: Final answer
    x = 965.46

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1.5x scale

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.