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Finding the Fourth Proportional to 990.51, 1,364.90 and 728.07

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Solution

The fourth proportional to 990.51, 1,364.90 and 728.07 is: 1,003.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.51 : 1,364.90 = 728.07 : x
  2. Step 2: Convert to fraction form
    990.51/1,364.90 = 728.07/x
  3. Step 3: Cross multiply
    990.51x = 1,364.90 × 728.07
  4. Step 4: Simplify right side
    990.51x = 993,739.10
  5. Step 5: Solve for x
    x = 993,739.10/990.51
  6. Step 6: Final answer
    x = 1,003.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.