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Finding the Fourth Proportional to 990.25, 1,485.15 and 374.02

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Solution

The fourth proportional to 990.25, 1,485.15 and 374.02 is: 560.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.25 : 1,485.15 = 374.02 : x
  2. Step 2: Convert to fraction form
    990.25/1,485.15 = 374.02/x
  3. Step 3: Cross multiply
    990.25x = 1,485.15 × 374.02
  4. Step 4: Simplify right side
    990.25x = 555,475.80
  5. Step 5: Solve for x
    x = 555,475.80/990.25
  6. Step 6: Final answer
    x = 560.95

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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.