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Finding the Fourth Proportional to 990.08, 1,485.26 and 340.66

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Solution

The fourth proportional to 990.08, 1,485.26 and 340.66 is: 511.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.08 : 1,485.26 = 340.66 : x
  2. Step 2: Convert to fraction form
    990.08/1,485.26 = 340.66/x
  3. Step 3: Cross multiply
    990.08x = 1,485.26 × 340.66
  4. Step 4: Simplify right side
    990.08x = 505,968.67
  5. Step 5: Solve for x
    x = 505,968.67/990.08
  6. Step 6: Final answer
    x = 511.04

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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.