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Finding the Fourth Proportional to 851.88, 1,175.40 and 838.92

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Solution

The fourth proportional to 851.88, 1,175.40 and 838.92 is: 1,157.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.88 : 1,175.40 = 838.92 : x
  2. Step 2: Convert to fraction form
    851.88/1,175.40 = 838.92/x
  3. Step 3: Cross multiply
    851.88x = 1,175.40 × 838.92
  4. Step 4: Simplify right side
    851.88x = 986,066.57
  5. Step 5: Solve for x
    x = 986,066.57/851.88
  6. Step 6: Final answer
    x = 1,157.52

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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.