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Finding the Fourth Proportional to 660.11, 989.70 and 400.18

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Solution

The fourth proportional to 660.11, 989.70 and 400.18 is: 599.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.11 : 989.70 = 400.18 : x
  2. Step 2: Convert to fraction form
    660.11/989.70 = 400.18/x
  3. Step 3: Cross multiply
    660.11x = 989.70 × 400.18
  4. Step 4: Simplify right side
    660.11x = 396,058.15
  5. Step 5: Solve for x
    x = 396,058.15/660.11
  6. Step 6: Final answer
    x = 599.99

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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.