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Finding the Fourth Proportional to 851.40, 1,175.04 and 835.20

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Solution

The fourth proportional to 851.40, 1,175.04 and 835.20 is: 1,152.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.40 : 1,175.04 = 835.20 : x
  2. Step 2: Convert to fraction form
    851.40/1,175.04 = 835.20/x
  3. Step 3: Cross multiply
    851.40x = 1,175.04 × 835.20
  4. Step 4: Simplify right side
    851.40x = 981,393.41
  5. Step 5: Solve for x
    x = 981,393.41/851.40
  6. Step 6: Final answer
    x = 1,152.68

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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.