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Finding the Fourth Proportional to 922.80, 1,384.56 and 489.36

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Solution

The fourth proportional to 922.80, 1,384.56 and 489.36 is: 734.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.80 : 1,384.56 = 489.36 : x
  2. Step 2: Convert to fraction form
    922.80/1,384.56 = 489.36/x
  3. Step 3: Cross multiply
    922.80x = 1,384.56 × 489.36
  4. Step 4: Simplify right side
    922.80x = 677,548.28
  5. Step 5: Solve for x
    x = 677,548.28/922.80
  6. Step 6: Final answer
    x = 734.23

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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.