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Finding the Fourth Proportional to 995.88, 1,374.94 and 641.98

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Solution

The fourth proportional to 995.88, 1,374.94 and 641.98 is: 886.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.88 : 1,374.94 = 641.98 : x
  2. Step 2: Convert to fraction form
    995.88/1,374.94 = 641.98/x
  3. Step 3: Cross multiply
    995.88x = 1,374.94 × 641.98
  4. Step 4: Simplify right side
    995.88x = 882,686.50
  5. Step 5: Solve for x
    x = 882,686.50/995.88
  6. Step 6: Final answer
    x = 886.33

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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.