Home / 1,127.15-1,555.28-629.80

Finding the Fourth Proportional to 1,127.15, 1,555.28 and 629.80

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Solution

The fourth proportional to 1,127.15, 1,555.28 and 629.80 is: 869.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.15 : 1,555.28 = 629.80 : x
  2. Step 2: Convert to fraction form
    1,127.15/1,555.28 = 629.80/x
  3. Step 3: Cross multiply
    1,127.15x = 1,555.28 × 629.80
  4. Step 4: Simplify right side
    1,127.15x = 979,513.27
  5. Step 5: Solve for x
    x = 979,513.27/1,127.15
  6. Step 6: Final answer
    x = 869.02

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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.