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Finding the Fourth Proportional to 554.40, 763.20 and 489.60

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Solution

The fourth proportional to 554.40, 763.20 and 489.60 is: 673.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.40 : 763.20 = 489.60 : x
  2. Step 2: Convert to fraction form
    554.40/763.20 = 489.60/x
  3. Step 3: Cross multiply
    554.40x = 763.20 × 489.60
  4. Step 4: Simplify right side
    554.40x = 373,662.72
  5. Step 5: Solve for x
    x = 373,662.72/554.40
  6. Step 6: Final answer
    x = 673.99

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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.