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Finding the Fourth Proportional to 66,409.71, 91,612.92 and 39,543.63

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Solution

The fourth proportional to 66,409.71, 91,612.92 and 39,543.63 is: 54,550.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,409.71 : 91,612.92 = 39,543.63 : x
  2. Step 2: Convert to fraction form
    66,409.71/91,612.92 = 39,543.63/x
  3. Step 3: Cross multiply
    66,409.71x = 91,612.92 × 39,543.63
  4. Step 4: Simplify right side
    66,409.71x = 3,622,707,411.70
  5. Step 5: Solve for x
    x = 3,622,707,411.70/66,409.71
  6. Step 6: Final answer
    x = 54,550.87

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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.