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Finding the Fourth Proportional to 84,004.40, 126,006.60 and 83,421.20

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Solution

The fourth proportional to 84,004.40, 126,006.60 and 83,421.20 is: 125,131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,004.40 : 126,006.60 = 83,421.20 : x
  2. Step 2: Convert to fraction form
    84,004.40/126,006.60 = 83,421.20/x
  3. Step 3: Cross multiply
    84,004.40x = 126,006.60 × 83,421.20
  4. Step 4: Simplify right side
    84,004.40x = 10,511,621,779.92
  5. Step 5: Solve for x
    x = 10,511,621,779.92/84,004.40
  6. Step 6: Final answer
    x = 125,131.80

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1.5x scale

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.