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Finding the Fourth Proportional to 840.08, 1,157.28 and 684.56

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Solution

The fourth proportional to 840.08, 1,157.28 and 684.56 is: 943.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.08 : 1,157.28 = 684.56 : x
  2. Step 2: Convert to fraction form
    840.08/1,157.28 = 684.56/x
  3. Step 3: Cross multiply
    840.08x = 1,157.28 × 684.56
  4. Step 4: Simplify right side
    840.08x = 792,227.60
  5. Step 5: Solve for x
    x = 792,227.60/840.08
  6. Step 6: Final answer
    x = 943.04

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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.