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Finding the Fourth Proportional to 99,805.40, 149,489.40 and 86,683.40

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Solution

The fourth proportional to 99,805.40, 149,489.40 and 86,683.40 is: 129,835.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,805.40 : 149,489.40 = 86,683.40 : x
  2. Step 2: Convert to fraction form
    99,805.40/149,489.40 = 86,683.40/x
  3. Step 3: Cross multiply
    99,805.40x = 149,489.40 × 86,683.40
  4. Step 4: Simplify right side
    99,805.40x = 12,958,249,455.96
  5. Step 5: Solve for x
    x = 12,958,249,455.96/99,805.40
  6. Step 6: Final answer
    x = 129,835.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.