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Finding the Fourth Proportional to 85,911.90, 128,805.48 and 57,762.06

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Solution

The fourth proportional to 85,911.90, 128,805.48 and 57,762.06 is: 86,601.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,911.90 : 128,805.48 = 57,762.06 : x
  2. Step 2: Convert to fraction form
    85,911.90/128,805.48 = 57,762.06/x
  3. Step 3: Cross multiply
    85,911.90x = 128,805.48 × 57,762.06
  4. Step 4: Simplify right side
    85,911.90x = 7,440,069,864.09
  5. Step 5: Solve for x
    x = 7,440,069,864.09/85,911.90
  6. Step 6: Final answer
    x = 86,601.16

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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.