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Finding the Fourth Proportional to 660.35, 986.58 and 551.00

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Solution

The fourth proportional to 660.35, 986.58 and 551.00 is: 823.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.35 : 986.58 = 551.00 : x
  2. Step 2: Convert to fraction form
    660.35/986.58 = 551.00/x
  3. Step 3: Cross multiply
    660.35x = 986.58 × 551.00
  4. Step 4: Simplify right side
    660.35x = 543,608.05
  5. Step 5: Solve for x
    x = 543,608.05/660.35
  6. Step 6: Final answer
    x = 823.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.