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Finding the Fourth Proportional to 990.05, 1,485.06 and 259.61

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Solution

The fourth proportional to 990.05, 1,485.06 and 259.61 is: 389.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.05 : 1,485.06 = 259.61 : x
  2. Step 2: Convert to fraction form
    990.05/1,485.06 = 259.61/x
  3. Step 3: Cross multiply
    990.05x = 1,485.06 × 259.61
  4. Step 4: Simplify right side
    990.05x = 385,536.43
  5. Step 5: Solve for x
    x = 385,536.43/990.05
  6. Step 6: Final answer
    x = 389.41

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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.