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Finding the Fourth Proportional to 129,130.71, 193,716.09 and 65,916.59

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Solution

The fourth proportional to 129,130.71, 193,716.09 and 65,916.59 is: 98,885.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,130.71 : 193,716.09 = 65,916.59 : x
  2. Step 2: Convert to fraction form
    129,130.71/193,716.09 = 65,916.59/x
  3. Step 3: Cross multiply
    129,130.71x = 193,716.09 × 65,916.59
  4. Step 4: Simplify right side
    129,130.71x = 12,769,103,112.35
  5. Step 5: Solve for x
    x = 12,769,103,112.35/129,130.71
  6. Step 6: Final answer
    x = 98,885.10

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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.