Home / 1,299.27-1,948.60-640.47

Finding the Fourth Proportional to 1,299.27, 1,948.60 and 640.47

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Solution

The fourth proportional to 1,299.27, 1,948.60 and 640.47 is: 960.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.27 : 1,948.60 = 640.47 : x
  2. Step 2: Convert to fraction form
    1,299.27/1,948.60 = 640.47/x
  3. Step 3: Cross multiply
    1,299.27x = 1,948.60 × 640.47
  4. Step 4: Simplify right side
    1,299.27x = 1,248,019.84
  5. Step 5: Solve for x
    x = 1,248,019.84/1,299.27
  6. Step 6: Final answer
    x = 960.55

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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.