Home / 1,640.28-2,460.38-407.69

Finding the Fourth Proportional to 1,640.28, 2,460.38 and 407.69

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Solution

The fourth proportional to 1,640.28, 2,460.38 and 407.69 is: 611.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.28 : 2,460.38 = 407.69 : x
  2. Step 2: Convert to fraction form
    1,640.28/2,460.38 = 407.69/x
  3. Step 3: Cross multiply
    1,640.28x = 2,460.38 × 407.69
  4. Step 4: Simplify right side
    1,640.28x = 1,003,072.32
  5. Step 5: Solve for x
    x = 1,003,072.32/1,640.28
  6. Step 6: Final answer
    x = 611.53

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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.