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Finding the Fourth Proportional to 990.76, 1,483.74 and 605.48

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Solution

The fourth proportional to 990.76, 1,483.74 and 605.48 is: 906.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.76 : 1,483.74 = 605.48 : x
  2. Step 2: Convert to fraction form
    990.76/1,483.74 = 605.48/x
  3. Step 3: Cross multiply
    990.76x = 1,483.74 × 605.48
  4. Step 4: Simplify right side
    990.76x = 898,374.90
  5. Step 5: Solve for x
    x = 898,374.90/990.76
  6. Step 6: Final answer
    x = 906.75

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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.