Home / 1,639.78-2,459.69-913.97

Finding the Fourth Proportional to 1,639.78, 2,459.69 and 913.97

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Solution

The fourth proportional to 1,639.78, 2,459.69 and 913.97 is: 1,370.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.78 : 2,459.69 = 913.97 : x
  2. Step 2: Convert to fraction form
    1,639.78/2,459.69 = 913.97/x
  3. Step 3: Cross multiply
    1,639.78x = 2,459.69 × 913.97
  4. Step 4: Simplify right side
    1,639.78x = 2,248,085.15
  5. Step 5: Solve for x
    x = 2,248,085.15/1,639.78
  6. Step 6: Final answer
    x = 1,370.97

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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.