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Finding the Fourth Proportional to 554.40, 766.80 and 489.60

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Solution

The fourth proportional to 554.40, 766.80 and 489.60 is: 677.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.40 : 766.80 = 489.60 : x
  2. Step 2: Convert to fraction form
    554.40/766.80 = 489.60/x
  3. Step 3: Cross multiply
    554.40x = 766.80 × 489.60
  4. Step 4: Simplify right side
    554.40x = 375,425.28
  5. Step 5: Solve for x
    x = 375,425.28/554.40
  6. Step 6: Final answer
    x = 677.17

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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.