Home / 1,280.21-1,918.08-1,143.32

Finding the Fourth Proportional to 1,280.21, 1,918.08 and 1,143.32

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Solution

The fourth proportional to 1,280.21, 1,918.08 and 1,143.32 is: 1,712.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.21 : 1,918.08 = 1,143.32 : x
  2. Step 2: Convert to fraction form
    1,280.21/1,918.08 = 1,143.32/x
  3. Step 3: Cross multiply
    1,280.21x = 1,918.08 × 1,143.32
  4. Step 4: Simplify right side
    1,280.21x = 2,192,969.64
  5. Step 5: Solve for x
    x = 2,192,969.64/1,280.21
  6. Step 6: Final answer
    x = 1,712.98

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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.