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Finding the Fourth Proportional to 189,605.72, 261,654.34 and 103,564.76

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Solution

The fourth proportional to 189,605.72, 261,654.34 and 103,564.76 is: 142,918.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,605.72 : 261,654.34 = 103,564.76 : x
  2. Step 2: Convert to fraction form
    189,605.72/261,654.34 = 103,564.76/x
  3. Step 3: Cross multiply
    189,605.72x = 261,654.34 × 103,564.76
  4. Step 4: Simplify right side
    189,605.72x = 27,098,168,287.96
  5. Step 5: Solve for x
    x = 27,098,168,287.96/189,605.72
  6. Step 6: Final answer
    x = 142,918.52

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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.