Home / 1,639.92-2,262.90-976.80

Finding the Fourth Proportional to 1,639.92, 2,262.90 and 976.80

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Solution

The fourth proportional to 1,639.92, 2,262.90 and 976.80 is: 1,347.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.92 : 2,262.90 = 976.80 : x
  2. Step 2: Convert to fraction form
    1,639.92/2,262.90 = 976.80/x
  3. Step 3: Cross multiply
    1,639.92x = 2,262.90 × 976.80
  4. Step 4: Simplify right side
    1,639.92x = 2,210,400.72
  5. Step 5: Solve for x
    x = 2,210,400.72/1,639.92
  6. Step 6: Final answer
    x = 1,347.87

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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.