Home / 1,139.82-1,686.48-1,136.58

Finding the Fourth Proportional to 1,139.82, 1,686.48 and 1,136.58

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Solution

The fourth proportional to 1,139.82, 1,686.48 and 1,136.58 is: 1,681.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.82 : 1,686.48 = 1,136.58 : x
  2. Step 2: Convert to fraction form
    1,139.82/1,686.48 = 1,136.58/x
  3. Step 3: Cross multiply
    1,139.82x = 1,686.48 × 1,136.58
  4. Step 4: Simplify right side
    1,139.82x = 1,916,819.44
  5. Step 5: Solve for x
    x = 1,916,819.44/1,139.82
  6. Step 6: Final answer
    x = 1,681.69

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.