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Finding the Fourth Proportional to 887.81, 1,225.20 and 489.48

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Solution

The fourth proportional to 887.81, 1,225.20 and 489.48 is: 675.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.81 : 1,225.20 = 489.48 : x
  2. Step 2: Convert to fraction form
    887.81/1,225.20 = 489.48/x
  3. Step 3: Cross multiply
    887.81x = 1,225.20 × 489.48
  4. Step 4: Simplify right side
    887.81x = 599,704.77
  5. Step 5: Solve for x
    x = 599,704.77/887.81
  6. Step 6: Final answer
    x = 675.49

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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.