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Finding the Fourth Proportional to 81,365.26, 112,188.40 and 65,219.66

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Solution

The fourth proportional to 81,365.26, 112,188.40 and 65,219.66 is: 89,926.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,365.26 : 112,188.40 = 65,219.66 : x
  2. Step 2: Convert to fraction form
    81,365.26/112,188.40 = 65,219.66/x
  3. Step 3: Cross multiply
    81,365.26x = 112,188.40 × 65,219.66
  4. Step 4: Simplify right side
    81,365.26x = 7,316,889,303.94
  5. Step 5: Solve for x
    x = 7,316,889,303.94/81,365.26
  6. Step 6: Final answer
    x = 89,926.45

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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.