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Finding the Fourth Proportional to 990.70, 1,486.05 and 297.30

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Solution

The fourth proportional to 990.70, 1,486.05 and 297.30 is: 445.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.70 : 1,486.05 = 297.30 : x
  2. Step 2: Convert to fraction form
    990.70/1,486.05 = 297.30/x
  3. Step 3: Cross multiply
    990.70x = 1,486.05 × 297.30
  4. Step 4: Simplify right side
    990.70x = 441,802.67
  5. Step 5: Solve for x
    x = 441,802.67/990.70
  6. Step 6: Final answer
    x = 445.95

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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.