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Finding the Fourth Proportional to 918.50, 1,268.34 and 685.22

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Solution

The fourth proportional to 918.50, 1,268.34 and 685.22 is: 946.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.50 : 1,268.34 = 685.22 : x
  2. Step 2: Convert to fraction form
    918.50/1,268.34 = 685.22/x
  3. Step 3: Cross multiply
    918.50x = 1,268.34 × 685.22
  4. Step 4: Simplify right side
    918.50x = 869,091.93
  5. Step 5: Solve for x
    x = 869,091.93/918.50
  6. Step 6: Final answer
    x = 946.21

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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.