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Finding the Fourth Proportional to 1,047.80, 1,446.65 and 811.34

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Solution

The fourth proportional to 1,047.80, 1,446.65 and 811.34 is: 1,120.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.80 : 1,446.65 = 811.34 : x
  2. Step 2: Convert to fraction form
    1,047.80/1,446.65 = 811.34/x
  3. Step 3: Cross multiply
    1,047.80x = 1,446.65 × 811.34
  4. Step 4: Simplify right side
    1,047.80x = 1,173,713.72
  5. Step 5: Solve for x
    x = 1,173,713.72/1,047.80
  6. Step 6: Final answer
    x = 1,120.17

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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.