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Finding the Fourth Proportional to 722.12, 990.02 and 708.99

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Solution

The fourth proportional to 722.12, 990.02 and 708.99 is: 972.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.12 : 990.02 = 708.99 : x
  2. Step 2: Convert to fraction form
    722.12/990.02 = 708.99/x
  3. Step 3: Cross multiply
    722.12x = 990.02 × 708.99
  4. Step 4: Simplify right side
    722.12x = 701,912.34
  5. Step 5: Solve for x
    x = 701,912.34/722.12
  6. Step 6: Final answer
    x = 972.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.