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Finding the Fourth Proportional to 865.14, 1,194.16 and 821.05

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Solution

The fourth proportional to 865.14, 1,194.16 and 821.05 is: 1,133.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.14 : 1,194.16 = 821.05 : x
  2. Step 2: Convert to fraction form
    865.14/1,194.16 = 821.05/x
  3. Step 3: Cross multiply
    865.14x = 1,194.16 × 821.05
  4. Step 4: Simplify right side
    865.14x = 980,465.07
  5. Step 5: Solve for x
    x = 980,465.07/865.14
  6. Step 6: Final answer
    x = 1,133.30

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1.5x scale

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.