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Finding the Fourth Proportional to 298.78, 448.40 and 144.80

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Solution

The fourth proportional to 298.78, 448.40 and 144.80 is: 217.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.78 : 448.40 = 144.80 : x
  2. Step 2: Convert to fraction form
    298.78/448.40 = 144.80/x
  3. Step 3: Cross multiply
    298.78x = 448.40 × 144.80
  4. Step 4: Simplify right side
    298.78x = 64,925.35
  5. Step 5: Solve for x
    x = 64,925.35/298.78
  6. Step 6: Final answer
    x = 217.30

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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.