Home / 85,679.30-128,554.50-52,400.54

Finding the Fourth Proportional to 85,679.30, 128,554.50 and 52,400.54

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Solution

The fourth proportional to 85,679.30, 128,554.50 and 52,400.54 is: 78,622.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,679.30 : 128,554.50 = 52,400.54 : x
  2. Step 2: Convert to fraction form
    85,679.30/128,554.50 = 52,400.54/x
  3. Step 3: Cross multiply
    85,679.30x = 128,554.50 × 52,400.54
  4. Step 4: Simplify right side
    85,679.30x = 6,736,325,219.43
  5. Step 5: Solve for x
    x = 6,736,325,219.43/85,679.30
  6. Step 6: Final answer
    x = 78,622.55

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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.