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Finding the Fourth Proportional to 85,694.70, 128,542.05 and 57,701.10

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Solution

The fourth proportional to 85,694.70, 128,542.05 and 57,701.10 is: 86,551.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,694.70 : 128,542.05 = 57,701.10 : x
  2. Step 2: Convert to fraction form
    85,694.70/128,542.05 = 57,701.10/x
  3. Step 3: Cross multiply
    85,694.70x = 128,542.05 × 57,701.10
  4. Step 4: Simplify right side
    85,694.70x = 7,417,017,681.26
  5. Step 5: Solve for x
    x = 7,417,017,681.26/85,694.70
  6. Step 6: Final answer
    x = 86,551.65

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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.