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Finding the Fourth Proportional to 85,583.70, 128,438.56 and 40,605.14

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Solution

The fourth proportional to 85,583.70, 128,438.56 and 40,605.14 is: 60,937.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,583.70 : 128,438.56 = 40,605.14 : x
  2. Step 2: Convert to fraction form
    85,583.70/128,438.56 = 40,605.14/x
  3. Step 3: Cross multiply
    85,583.70x = 128,438.56 × 40,605.14
  4. Step 4: Simplify right side
    85,583.70x = 5,215,265,710.20
  5. Step 5: Solve for x
    x = 5,215,265,710.20/85,583.70
  6. Step 6: Final answer
    x = 60,937.61

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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.