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Finding the Fourth Proportional to 113,581, 156,739.92 and 61,898.80

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Solution

The fourth proportional to 113,581, 156,739.92 and 61,898.80 is: 85,419.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,581 : 156,739.92 = 61,898.80 : x
  2. Step 2: Convert to fraction form
    113,581/156,739.92 = 61,898.80/x
  3. Step 3: Cross multiply
    113,581x = 156,739.92 × 61,898.80
  4. Step 4: Simplify right side
    113,581x = 9,702,012,960.10
  5. Step 5: Solve for x
    x = 9,702,012,960.10/113,581
  6. Step 6: Final answer
    x = 85,419.33

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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.