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Finding the Fourth Proportional to 990.80, 1,485.99 and 627.92

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Solution

The fourth proportional to 990.80, 1,485.99 and 627.92 is: 941.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.80 : 1,485.99 = 627.92 : x
  2. Step 2: Convert to fraction form
    990.80/1,485.99 = 627.92/x
  3. Step 3: Cross multiply
    990.80x = 1,485.99 × 627.92
  4. Step 4: Simplify right side
    990.80x = 933,075.41
  5. Step 5: Solve for x
    x = 933,075.41/990.80
  6. Step 6: Final answer
    x = 941.74

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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.