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Finding the Fourth Proportional to 66,665.36, 91,999.66 and 39,802.86

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Solution

The fourth proportional to 66,665.36, 91,999.66 and 39,802.86 is: 54,928.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,665.36 : 91,999.66 = 39,802.86 : x
  2. Step 2: Convert to fraction form
    66,665.36/91,999.66 = 39,802.86/x
  3. Step 3: Cross multiply
    66,665.36x = 91,999.66 × 39,802.86
  4. Step 4: Simplify right side
    66,665.36x = 3,661,849,587.03
  5. Step 5: Solve for x
    x = 3,661,849,587.03/66,665.36
  6. Step 6: Final answer
    x = 54,928.82

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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.