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Finding the Fourth Proportional to 989.37, 1,485.41 and 556.83

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Solution

The fourth proportional to 989.37, 1,485.41 and 556.83 is: 836.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.37 : 1,485.41 = 556.83 : x
  2. Step 2: Convert to fraction form
    989.37/1,485.41 = 556.83/x
  3. Step 3: Cross multiply
    989.37x = 1,485.41 × 556.83
  4. Step 4: Simplify right side
    989.37x = 827,118.07
  5. Step 5: Solve for x
    x = 827,118.07/989.37
  6. Step 6: Final answer
    x = 836.00

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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.