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Finding the Fourth Proportional to 995.86, 1,374.40 and 553.80

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Solution

The fourth proportional to 995.86, 1,374.40 and 553.80 is: 764.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.86 : 1,374.40 = 553.80 : x
  2. Step 2: Convert to fraction form
    995.86/1,374.40 = 553.80/x
  3. Step 3: Cross multiply
    995.86x = 1,374.40 × 553.80
  4. Step 4: Simplify right side
    995.86x = 761,142.72
  5. Step 5: Solve for x
    x = 761,142.72/995.86
  6. Step 6: Final answer
    x = 764.31

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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.