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Finding the Fourth Proportional to 1,162.12, 1,602.78 and 812.80

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Solution

The fourth proportional to 1,162.12, 1,602.78 and 812.80 is: 1,121.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.12 : 1,602.78 = 812.80 : x
  2. Step 2: Convert to fraction form
    1,162.12/1,602.78 = 812.80/x
  3. Step 3: Cross multiply
    1,162.12x = 1,602.78 × 812.80
  4. Step 4: Simplify right side
    1,162.12x = 1,302,739.58
  5. Step 5: Solve for x
    x = 1,302,739.58/1,162.12
  6. Step 6: Final answer
    x = 1,121.00

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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.