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Finding the Fourth Proportional to 661.37, 990.95 and 400.58

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Solution

The fourth proportional to 661.37, 990.95 and 400.58 is: 600.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.37 : 990.95 = 400.58 : x
  2. Step 2: Convert to fraction form
    661.37/990.95 = 400.58/x
  3. Step 3: Cross multiply
    661.37x = 990.95 × 400.58
  4. Step 4: Simplify right side
    661.37x = 396,954.75
  5. Step 5: Solve for x
    x = 396,954.75/661.37
  6. Step 6: Final answer
    x = 600.20

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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.