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Finding the Fourth Proportional to 298.72, 448.20 and 287.12

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Solution

The fourth proportional to 298.72, 448.20 and 287.12 is: 430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.72 : 448.20 = 287.12 : x
  2. Step 2: Convert to fraction form
    298.72/448.20 = 287.12/x
  3. Step 3: Cross multiply
    298.72x = 448.20 × 287.12
  4. Step 4: Simplify right side
    298.72x = 128,687.18
  5. Step 5: Solve for x
    x = 128,687.18/298.72
  6. Step 6: Final answer
    x = 430.80

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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.