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Finding the Fourth Proportional to 665.12, 998.40 and 376.40

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Solution

The fourth proportional to 665.12, 998.40 and 376.40 is: 565.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.12 : 998.40 = 376.40 : x
  2. Step 2: Convert to fraction form
    665.12/998.40 = 376.40/x
  3. Step 3: Cross multiply
    665.12x = 998.40 × 376.40
  4. Step 4: Simplify right side
    665.12x = 375,797.76
  5. Step 5: Solve for x
    x = 375,797.76/665.12
  6. Step 6: Final answer
    x = 565.01

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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.