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Finding the Fourth Proportional to 1,280.52, 1,918.02 and 867.39

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Solution

The fourth proportional to 1,280.52, 1,918.02 and 867.39 is: 1,299.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.52 : 1,918.02 = 867.39 : x
  2. Step 2: Convert to fraction form
    1,280.52/1,918.02 = 867.39/x
  3. Step 3: Cross multiply
    1,280.52x = 1,918.02 × 867.39
  4. Step 4: Simplify right side
    1,280.52x = 1,663,671.37
  5. Step 5: Solve for x
    x = 1,663,671.37/1,280.52
  6. Step 6: Final answer
    x = 1,299.22

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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.