Home / 85,683.40-128,525.10-54,190.60

Finding the Fourth Proportional to 85,683.40, 128,525.10 and 54,190.60

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Solution

The fourth proportional to 85,683.40, 128,525.10 and 54,190.60 is: 81,285.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,683.40 : 128,525.10 = 54,190.60 : x
  2. Step 2: Convert to fraction form
    85,683.40/128,525.10 = 54,190.60/x
  3. Step 3: Cross multiply
    85,683.40x = 128,525.10 × 54,190.60
  4. Step 4: Simplify right side
    85,683.40x = 6,964,852,284.06
  5. Step 5: Solve for x
    x = 6,964,852,284.06/85,683.40
  6. Step 6: Final answer
    x = 81,285.90

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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.