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Finding the Fourth Proportional to 153,491.03, 211,814.43 and 85,507.91

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Solution

The fourth proportional to 153,491.03, 211,814.43 and 85,507.91 is: 117,999.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,491.03 : 211,814.43 = 85,507.91 : x
  2. Step 2: Convert to fraction form
    153,491.03/211,814.43 = 85,507.91/x
  3. Step 3: Cross multiply
    153,491.03x = 211,814.43 × 85,507.91
  4. Step 4: Simplify right side
    153,491.03x = 18,111,809,217.14
  5. Step 5: Solve for x
    x = 18,111,809,217.14/153,491.03
  6. Step 6: Final answer
    x = 117,999.14

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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.