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Finding the Fourth Proportional to 918.25, 1,268.27 and 607.21

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Solution

The fourth proportional to 918.25, 1,268.27 and 607.21 is: 838.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.25 : 1,268.27 = 607.21 : x
  2. Step 2: Convert to fraction form
    918.25/1,268.27 = 607.21/x
  3. Step 3: Cross multiply
    918.25x = 1,268.27 × 607.21
  4. Step 4: Simplify right side
    918.25x = 770,103.19
  5. Step 5: Solve for x
    x = 770,103.19/918.25
  6. Step 6: Final answer
    x = 838.66

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Double scale
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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.