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Finding the Fourth Proportional to 887.64, 1,224.94 and 489.31

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Solution

The fourth proportional to 887.64, 1,224.94 and 489.31 is: 675.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.64 : 1,224.94 = 489.31 : x
  2. Step 2: Convert to fraction form
    887.64/1,224.94 = 489.31/x
  3. Step 3: Cross multiply
    887.64x = 1,224.94 × 489.31
  4. Step 4: Simplify right side
    887.64x = 599,371.28
  5. Step 5: Solve for x
    x = 599,371.28/887.64
  6. Step 6: Final answer
    x = 675.24

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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.