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Finding the Fourth Proportional to 85,852.80, 128,779.20 and 73,168.20

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Solution

The fourth proportional to 85,852.80, 128,779.20 and 73,168.20 is: 109,752.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,852.80 : 128,779.20 = 73,168.20 : x
  2. Step 2: Convert to fraction form
    85,852.80/128,779.20 = 73,168.20/x
  3. Step 3: Cross multiply
    85,852.80x = 128,779.20 × 73,168.20
  4. Step 4: Simplify right side
    85,852.80x = 9,422,542,261.44
  5. Step 5: Solve for x
    x = 9,422,542,261.44/85,852.80
  6. Step 6: Final answer
    x = 109,752.30

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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.