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Finding the Fourth Proportional to 85,683.60, 128,525.40 and 76,498.20

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Solution

The fourth proportional to 85,683.60, 128,525.40 and 76,498.20 is: 114,747.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,683.60 : 128,525.40 = 76,498.20 : x
  2. Step 2: Convert to fraction form
    85,683.60/128,525.40 = 76,498.20/x
  3. Step 3: Cross multiply
    85,683.60x = 128,525.40 × 76,498.20
  4. Step 4: Simplify right side
    85,683.60x = 9,831,961,754.28
  5. Step 5: Solve for x
    x = 9,831,961,754.28/85,683.60
  6. Step 6: Final answer
    x = 114,747.30

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Similar ratio
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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.