Home / 1,639.66-2,262.70-931.62

Finding the Fourth Proportional to 1,639.66, 2,262.70 and 931.62

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Solution

The fourth proportional to 1,639.66, 2,262.70 and 931.62 is: 1,285.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.66 : 2,262.70 = 931.62 : x
  2. Step 2: Convert to fraction form
    1,639.66/2,262.70 = 931.62/x
  3. Step 3: Cross multiply
    1,639.66x = 2,262.70 × 931.62
  4. Step 4: Simplify right side
    1,639.66x = 2,107,976.57
  5. Step 5: Solve for x
    x = 2,107,976.57/1,639.66
  6. Step 6: Final answer
    x = 1,285.62

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1.5x scale

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.