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Finding the Fourth Proportional to 842.94, 1,160.85 and 840.21

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Solution

The fourth proportional to 842.94, 1,160.85 and 840.21 is: 1,157.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.94 : 1,160.85 = 840.21 : x
  2. Step 2: Convert to fraction form
    842.94/1,160.85 = 840.21/x
  3. Step 3: Cross multiply
    842.94x = 1,160.85 × 840.21
  4. Step 4: Simplify right side
    842.94x = 975,357.78
  5. Step 5: Solve for x
    x = 975,357.78/842.94
  6. Step 6: Final answer
    x = 1,157.09

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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.