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Finding the Fourth Proportional to 919.35, 1,269.75 and 712.04

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Solution

The fourth proportional to 919.35, 1,269.75 and 712.04 is: 983.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.35 : 1,269.75 = 712.04 : x
  2. Step 2: Convert to fraction form
    919.35/1,269.75 = 712.04/x
  3. Step 3: Cross multiply
    919.35x = 1,269.75 × 712.04
  4. Step 4: Simplify right side
    919.35x = 904,114.25
  5. Step 5: Solve for x
    x = 904,114.25/919.35
  6. Step 6: Final answer
    x = 983.43

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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.