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Finding the Fourth Proportional to 919.70, 1,269.18 and 684.70

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Solution

The fourth proportional to 919.70, 1,269.18 and 684.70 is: 944.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.70 : 1,269.18 = 684.70 : x
  2. Step 2: Convert to fraction form
    919.70/1,269.18 = 684.70/x
  3. Step 3: Cross multiply
    919.70x = 1,269.18 × 684.70
  4. Step 4: Simplify right side
    919.70x = 869,011.15
  5. Step 5: Solve for x
    x = 869,011.15/919.70
  6. Step 6: Final answer
    x = 944.88

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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.