Home / 1,127.25-1,555.59-629.90

Finding the Fourth Proportional to 1,127.25, 1,555.59 and 629.90

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Solution

The fourth proportional to 1,127.25, 1,555.59 and 629.90 is: 869.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.25 : 1,555.59 = 629.90 : x
  2. Step 2: Convert to fraction form
    1,127.25/1,555.59 = 629.90/x
  3. Step 3: Cross multiply
    1,127.25x = 1,555.59 × 629.90
  4. Step 4: Simplify right side
    1,127.25x = 979,866.14
  5. Step 5: Solve for x
    x = 979,866.14/1,127.25
  6. Step 6: Final answer
    x = 869.25

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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.