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Finding the Fourth Proportional to 919.83, 1,269.15 and 671.28

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Solution

The fourth proportional to 919.83, 1,269.15 and 671.28 is: 926.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.83 : 1,269.15 = 671.28 : x
  2. Step 2: Convert to fraction form
    919.83/1,269.15 = 671.28/x
  3. Step 3: Cross multiply
    919.83x = 1,269.15 × 671.28
  4. Step 4: Simplify right side
    919.83x = 851,955.01
  5. Step 5: Solve for x
    x = 851,955.01/919.83
  6. Step 6: Final answer
    x = 926.21

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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.