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Finding the Fourth Proportional to 990.47, 1,486.22 and 442.53

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Solution

The fourth proportional to 990.47, 1,486.22 and 442.53 is: 664.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.47 : 1,486.22 = 442.53 : x
  2. Step 2: Convert to fraction form
    990.47/1,486.22 = 442.53/x
  3. Step 3: Cross multiply
    990.47x = 1,486.22 × 442.53
  4. Step 4: Simplify right side
    990.47x = 657,694.72
  5. Step 5: Solve for x
    x = 657,694.72/990.47
  6. Step 6: Final answer
    x = 664.03

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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.