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Finding the Fourth Proportional to 66,348.72, 91,555.11 and 39,486.89

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Solution

The fourth proportional to 66,348.72, 91,555.11 and 39,486.89 is: 54,488.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,348.72 : 91,555.11 = 39,486.89 : x
  2. Step 2: Convert to fraction form
    66,348.72/91,555.11 = 39,486.89/x
  3. Step 3: Cross multiply
    66,348.72x = 91,555.11 × 39,486.89
  4. Step 4: Simplify right side
    66,348.72x = 3,615,226,786.40
  5. Step 5: Solve for x
    x = 3,615,226,786.40/66,348.72
  6. Step 6: Final answer
    x = 54,488.27

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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.