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Finding the Fourth Proportional to 129,641.63, 178,810.94 and 99,083.76

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Solution

The fourth proportional to 129,641.63, 178,810.94 and 99,083.76 is: 136,663.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,641.63 : 178,810.94 = 99,083.76 : x
  2. Step 2: Convert to fraction form
    129,641.63/178,810.94 = 99,083.76/x
  3. Step 3: Cross multiply
    129,641.63x = 178,810.94 × 99,083.76
  4. Step 4: Simplify right side
    129,641.63x = 17,717,259,768.92
  5. Step 5: Solve for x
    x = 17,717,259,768.92/129,641.63
  6. Step 6: Final answer
    x = 136,663.36

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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.