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Finding the Fourth Proportional to 1,161, 1,602.99 and 812.16

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Solution

The fourth proportional to 1,161, 1,602.99 and 812.16 is: 1,121.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161 : 1,602.99 = 812.16 : x
  2. Step 2: Convert to fraction form
    1,161/1,602.99 = 812.16/x
  3. Step 3: Cross multiply
    1,161x = 1,602.99 × 812.16
  4. Step 4: Simplify right side
    1,161x = 1,301,884.36
  5. Step 5: Solve for x
    x = 1,301,884.36/1,161
  6. Step 6: Final answer
    x = 1,121.35

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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.