Home / 1,137.10-1,569.12-639.82

Finding the Fourth Proportional to 1,137.10, 1,569.12 and 639.82

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Solution

The fourth proportional to 1,137.10, 1,569.12 and 639.82 is: 882.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.10 : 1,569.12 = 639.82 : x
  2. Step 2: Convert to fraction form
    1,137.10/1,569.12 = 639.82/x
  3. Step 3: Cross multiply
    1,137.10x = 1,569.12 × 639.82
  4. Step 4: Simplify right side
    1,137.10x = 1,003,954.36
  5. Step 5: Solve for x
    x = 1,003,954.36/1,137.10
  6. Step 6: Final answer
    x = 882.91

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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.