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Finding the Fourth Proportional to 857.58, 1,175.74 and 842.01

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Solution

The fourth proportional to 857.58, 1,175.74 and 842.01 is: 1,154.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.58 : 1,175.74 = 842.01 : x
  2. Step 2: Convert to fraction form
    857.58/1,175.74 = 842.01/x
  3. Step 3: Cross multiply
    857.58x = 1,175.74 × 842.01
  4. Step 4: Simplify right side
    857.58x = 989,984.84
  5. Step 5: Solve for x
    x = 989,984.84/857.58
  6. Step 6: Final answer
    x = 1,154.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.