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Finding the Fourth Proportional to 85,611.60, 128,417.40 and 22,431.60

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Solution

The fourth proportional to 85,611.60, 128,417.40 and 22,431.60 is: 33,647.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.60 : 128,417.40 = 22,431.60 : x
  2. Step 2: Convert to fraction form
    85,611.60/128,417.40 = 22,431.60/x
  3. Step 3: Cross multiply
    85,611.60x = 128,417.40 × 22,431.60
  4. Step 4: Simplify right side
    85,611.60x = 2,880,607,749.84
  5. Step 5: Solve for x
    x = 2,880,607,749.84/85,611.60
  6. Step 6: Final answer
    x = 33,647.40

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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.