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Finding the Fourth Proportional to 845.14, 1,261.81 and 729.46

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Solution

The fourth proportional to 845.14, 1,261.81 and 729.46 is: 1,089.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.14 : 1,261.81 = 729.46 : x
  2. Step 2: Convert to fraction form
    845.14/1,261.81 = 729.46/x
  3. Step 3: Cross multiply
    845.14x = 1,261.81 × 729.46
  4. Step 4: Simplify right side
    845.14x = 920,436.28
  5. Step 5: Solve for x
    x = 920,436.28/845.14
  6. Step 6: Final answer
    x = 1,089.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.