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Finding the Fourth Proportional to 86,855.31, 119,805.75 and 66,681.45

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Solution

The fourth proportional to 86,855.31, 119,805.75 and 66,681.45 is: 91,978.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,855.31 : 119,805.75 = 66,681.45 : x
  2. Step 2: Convert to fraction form
    86,855.31/119,805.75 = 66,681.45/x
  3. Step 3: Cross multiply
    86,855.31x = 119,805.75 × 66,681.45
  4. Step 4: Simplify right side
    86,855.31x = 7,988,821,128.34
  5. Step 5: Solve for x
    x = 7,988,821,128.34/86,855.31
  6. Step 6: Final answer
    x = 91,978.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.