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Finding the Fourth Proportional to 990.25, 1,485.29 and 297.07

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Solution

The fourth proportional to 990.25, 1,485.29 and 297.07 is: 445.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.25 : 1,485.29 = 297.07 : x
  2. Step 2: Convert to fraction form
    990.25/1,485.29 = 297.07/x
  3. Step 3: Cross multiply
    990.25x = 1,485.29 × 297.07
  4. Step 4: Simplify right side
    990.25x = 441,238.81
  5. Step 5: Solve for x
    x = 441,238.81/990.25
  6. Step 6: Final answer
    x = 445.58

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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.