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Finding the Fourth Proportional to 990.11, 1,486.01 and 551.79

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Solution

The fourth proportional to 990.11, 1,486.01 and 551.79 is: 828.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.11 : 1,486.01 = 551.79 : x
  2. Step 2: Convert to fraction form
    990.11/1,486.01 = 551.79/x
  3. Step 3: Cross multiply
    990.11x = 1,486.01 × 551.79
  4. Step 4: Simplify right side
    990.11x = 819,962.70
  5. Step 5: Solve for x
    x = 819,962.70/990.11
  6. Step 6: Final answer
    x = 828.16

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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.