Home / 1,137.17-1,569.33-639.80

Finding the Fourth Proportional to 1,137.17, 1,569.33 and 639.80

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Solution

The fourth proportional to 1,137.17, 1,569.33 and 639.80 is: 882.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.17 : 1,569.33 = 639.80 : x
  2. Step 2: Convert to fraction form
    1,137.17/1,569.33 = 639.80/x
  3. Step 3: Cross multiply
    1,137.17x = 1,569.33 × 639.80
  4. Step 4: Simplify right side
    1,137.17x = 1,004,057.33
  5. Step 5: Solve for x
    x = 1,004,057.33/1,137.17
  6. Step 6: Final answer
    x = 882.94

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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.