Home / 1,639.88-2,262.90-931.72

Finding the Fourth Proportional to 1,639.88, 2,262.90 and 931.72

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Solution

The fourth proportional to 1,639.88, 2,262.90 and 931.72 is: 1,285.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.88 : 2,262.90 = 931.72 : x
  2. Step 2: Convert to fraction form
    1,639.88/2,262.90 = 931.72/x
  3. Step 3: Cross multiply
    1,639.88x = 2,262.90 × 931.72
  4. Step 4: Simplify right side
    1,639.88x = 2,108,389.19
  5. Step 5: Solve for x
    x = 2,108,389.19/1,639.88
  6. Step 6: Final answer
    x = 1,285.70

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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.