Home / 1,112.80-1,669.20-291.14

Finding the Fourth Proportional to 1,112.80, 1,669.20 and 291.14

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Solution

The fourth proportional to 1,112.80, 1,669.20 and 291.14 is: 436.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.80 : 1,669.20 = 291.14 : x
  2. Step 2: Convert to fraction form
    1,112.80/1,669.20 = 291.14/x
  3. Step 3: Cross multiply
    1,112.80x = 1,669.20 × 291.14
  4. Step 4: Simplify right side
    1,112.80x = 485,970.89
  5. Step 5: Solve for x
    x = 485,970.89/1,112.80
  6. Step 6: Final answer
    x = 436.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.