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Finding the Fourth Proportional to 919.26, 1,270.89 and 880.38

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Solution

The fourth proportional to 919.26, 1,270.89 and 880.38 is: 1,217.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.26 : 1,270.89 = 880.38 : x
  2. Step 2: Convert to fraction form
    919.26/1,270.89 = 880.38/x
  3. Step 3: Cross multiply
    919.26x = 1,270.89 × 880.38
  4. Step 4: Simplify right side
    919.26x = 1,118,866.14
  5. Step 5: Solve for x
    x = 1,118,866.14/919.26
  6. Step 6: Final answer
    x = 1,217.14

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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.