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Finding the Fourth Proportional to 99,805.70, 149,708.55 and 86,392.10

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Solution

The fourth proportional to 99,805.70, 149,708.55 and 86,392.10 is: 129,588.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,805.70 : 149,708.55 = 86,392.10 : x
  2. Step 2: Convert to fraction form
    99,805.70/149,708.55 = 86,392.10/x
  3. Step 3: Cross multiply
    99,805.70x = 149,708.55 × 86,392.10
  4. Step 4: Simplify right side
    99,805.70x = 12,933,636,022.46
  5. Step 5: Solve for x
    x = 12,933,636,022.46/99,805.70
  6. Step 6: Final answer
    x = 129,588.15

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1.5x scale

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.