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Finding the Fourth Proportional to 1,280.12, 1,767 and 887.66

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Solution

The fourth proportional to 1,280.12, 1,767 and 887.66 is: 1,225.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.12 : 1,767 = 887.66 : x
  2. Step 2: Convert to fraction form
    1,280.12/1,767 = 887.66/x
  3. Step 3: Cross multiply
    1,280.12x = 1,767 × 887.66
  4. Step 4: Simplify right side
    1,280.12x = 1,568,495.22
  5. Step 5: Solve for x
    x = 1,568,495.22/1,280.12
  6. Step 6: Final answer
    x = 1,225.27

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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.