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Finding the Fourth Proportional to 845.80, 1,268.70 and 831.40

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Solution

The fourth proportional to 845.80, 1,268.70 and 831.40 is: 1,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.80 : 1,268.70 = 831.40 : x
  2. Step 2: Convert to fraction form
    845.80/1,268.70 = 831.40/x
  3. Step 3: Cross multiply
    845.80x = 1,268.70 × 831.40
  4. Step 4: Simplify right side
    845.80x = 1,054,797.18
  5. Step 5: Solve for x
    x = 1,054,797.18/845.80
  6. Step 6: Final answer
    x = 1,247.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.