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Finding the Fourth Proportional to 990.53, 1,485.68 and 624.20

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Solution

The fourth proportional to 990.53, 1,485.68 and 624.20 is: 936.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.53 : 1,485.68 = 624.20 : x
  2. Step 2: Convert to fraction form
    990.53/1,485.68 = 624.20/x
  3. Step 3: Cross multiply
    990.53x = 1,485.68 × 624.20
  4. Step 4: Simplify right side
    990.53x = 927,361.46
  5. Step 5: Solve for x
    x = 927,361.46/990.53
  6. Step 6: Final answer
    x = 936.23

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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.