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Finding the Fourth Proportional to 660.74, 990.34 and 368.11

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Solution

The fourth proportional to 660.74, 990.34 and 368.11 is: 551.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.74 : 990.34 = 368.11 : x
  2. Step 2: Convert to fraction form
    660.74/990.34 = 368.11/x
  3. Step 3: Cross multiply
    660.74x = 990.34 × 368.11
  4. Step 4: Simplify right side
    660.74x = 364,550.66
  5. Step 5: Solve for x
    x = 364,550.66/660.74
  6. Step 6: Final answer
    x = 551.73

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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.