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Finding the Fourth Proportional to 835.40, 1,250.40 and 651.80

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Solution

The fourth proportional to 835.40, 1,250.40 and 651.80 is: 975.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.40 : 1,250.40 = 651.80 : x
  2. Step 2: Convert to fraction form
    835.40/1,250.40 = 651.80/x
  3. Step 3: Cross multiply
    835.40x = 1,250.40 × 651.80
  4. Step 4: Simplify right side
    835.40x = 815,010.72
  5. Step 5: Solve for x
    x = 815,010.72/835.40
  6. Step 6: Final answer
    x = 975.59

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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.