Home / 1,137.12-1,569.24-639.76

Finding the Fourth Proportional to 1,137.12, 1,569.24 and 639.76

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Solution

The fourth proportional to 1,137.12, 1,569.24 and 639.76 is: 882.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.12 : 1,569.24 = 639.76 : x
  2. Step 2: Convert to fraction form
    1,137.12/1,569.24 = 639.76/x
  3. Step 3: Cross multiply
    1,137.12x = 1,569.24 × 639.76
  4. Step 4: Simplify right side
    1,137.12x = 1,003,936.98
  5. Step 5: Solve for x
    x = 1,003,936.98/1,137.12
  6. Step 6: Final answer
    x = 882.88

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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.