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Finding the Fourth Proportional to 836.07, 1,261.63 and 805.55

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Solution

The fourth proportional to 836.07, 1,261.63 and 805.55 is: 1,215.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.07 : 1,261.63 = 805.55 : x
  2. Step 2: Convert to fraction form
    836.07/1,261.63 = 805.55/x
  3. Step 3: Cross multiply
    836.07x = 1,261.63 × 805.55
  4. Step 4: Simplify right side
    836.07x = 1,016,296.21
  5. Step 5: Solve for x
    x = 1,016,296.21/836.07
  6. Step 6: Final answer
    x = 1,215.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.