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Finding the Fourth Proportional to 85,803.80, 128,705.70 and 26,657.60

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Solution

The fourth proportional to 85,803.80, 128,705.70 and 26,657.60 is: 39,986.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,803.80 : 128,705.70 = 26,657.60 : x
  2. Step 2: Convert to fraction form
    85,803.80/128,705.70 = 26,657.60/x
  3. Step 3: Cross multiply
    85,803.80x = 128,705.70 × 26,657.60
  4. Step 4: Simplify right side
    85,803.80x = 3,430,985,068.32
  5. Step 5: Solve for x
    x = 3,430,985,068.32/85,803.80
  6. Step 6: Final answer
    x = 39,986.40

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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.