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Finding the Fourth Proportional to 995.76, 1,374.77 and 641.86

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Solution

The fourth proportional to 995.76, 1,374.77 and 641.86 is: 886.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.76 : 1,374.77 = 641.86 : x
  2. Step 2: Convert to fraction form
    995.76/1,374.77 = 641.86/x
  3. Step 3: Cross multiply
    995.76x = 1,374.77 × 641.86
  4. Step 4: Simplify right side
    995.76x = 882,409.87
  5. Step 5: Solve for x
    x = 882,409.87/995.76
  6. Step 6: Final answer
    x = 886.17

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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.