Home / 1,142.85-1,583.76-1,120.98

Finding the Fourth Proportional to 1,142.85, 1,583.76 and 1,120.98

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Solution

The fourth proportional to 1,142.85, 1,583.76 and 1,120.98 is: 1,553.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.85 : 1,583.76 = 1,120.98 : x
  2. Step 2: Convert to fraction form
    1,142.85/1,583.76 = 1,120.98/x
  3. Step 3: Cross multiply
    1,142.85x = 1,583.76 × 1,120.98
  4. Step 4: Simplify right side
    1,142.85x = 1,775,363.28
  5. Step 5: Solve for x
    x = 1,775,363.28/1,142.85
  6. Step 6: Final answer
    x = 1,553.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.