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Finding the Fourth Proportional to 842.10, 1,261.80 and 704.40

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Solution

The fourth proportional to 842.10, 1,261.80 and 704.40 is: 1,055.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.10 : 1,261.80 = 704.40 : x
  2. Step 2: Convert to fraction form
    842.10/1,261.80 = 704.40/x
  3. Step 3: Cross multiply
    842.10x = 1,261.80 × 704.40
  4. Step 4: Simplify right side
    842.10x = 888,811.92
  5. Step 5: Solve for x
    x = 888,811.92/842.10
  6. Step 6: Final answer
    x = 1,055.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.