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Finding the Fourth Proportional to 1,639.70, 2,460.57 and 665.81

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Solution

The fourth proportional to 1,639.70, 2,460.57 and 665.81 is: 999.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.70 : 2,460.57 = 665.81 : x
  2. Step 2: Convert to fraction form
    1,639.70/2,460.57 = 665.81/x
  3. Step 3: Cross multiply
    1,639.70x = 2,460.57 × 665.81
  4. Step 4: Simplify right side
    1,639.70x = 1,638,268.78
  5. Step 5: Solve for x
    x = 1,638,268.78/1,639.70
  6. Step 6: Final answer
    x = 999.13

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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.