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Finding the Fourth Proportional to 991,630.80, 1,392,015.60 and 991,630.80

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Solution

The fourth proportional to 991,630.80, 1,392,015.60 and 991,630.80 is: 1,392,015.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,630.80 : 1,392,015.60 = 991,630.80 : x
  2. Step 2: Convert to fraction form
    991,630.80/1,392,015.60 = 991,630.80/x
  3. Step 3: Cross multiply
    991,630.80x = 1,392,015.60 × 991,630.80
  4. Step 4: Simplify right side
    991,630.80x = 1,380,365,543,040.48
  5. Step 5: Solve for x
    x = 1,380,365,543,040.48/991,630.80
  6. Step 6: Final answer
    x = 1,392,015.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.