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Finding the Fourth Proportional to 370.72, 555.44 and 312.88

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Solution

The fourth proportional to 370.72, 555.44 and 312.88 is: 468.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.72 : 555.44 = 312.88 : x
  2. Step 2: Convert to fraction form
    370.72/555.44 = 312.88/x
  3. Step 3: Cross multiply
    370.72x = 555.44 × 312.88
  4. Step 4: Simplify right side
    370.72x = 173,786.07
  5. Step 5: Solve for x
    x = 173,786.07/370.72
  6. Step 6: Final answer
    x = 468.78

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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.