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Finding the Fourth Proportional to 990.02, 1,485.01 and 340.74

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Solution

The fourth proportional to 990.02, 1,485.01 and 340.74 is: 511.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.02 : 1,485.01 = 340.74 : x
  2. Step 2: Convert to fraction form
    990.02/1,485.01 = 340.74/x
  3. Step 3: Cross multiply
    990.02x = 1,485.01 × 340.74
  4. Step 4: Simplify right side
    990.02x = 505,993.18
  5. Step 5: Solve for x
    x = 505,993.18/990.02
  6. Step 6: Final answer
    x = 511.10

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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.