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Finding the Fourth Proportional to 851.80, 1,268.20 and 839.64

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Solution

The fourth proportional to 851.80, 1,268.20 and 839.64 is: 1,250.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.80 : 1,268.20 = 839.64 : x
  2. Step 2: Convert to fraction form
    851.80/1,268.20 = 839.64/x
  3. Step 3: Cross multiply
    851.80x = 1,268.20 × 839.64
  4. Step 4: Simplify right side
    851.80x = 1,064,831.45
  5. Step 5: Solve for x
    x = 1,064,831.45/851.80
  6. Step 6: Final answer
    x = 1,250.10

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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.