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Finding the Fourth Proportional to 86,532.69, 129,706.70 and 39,142.83

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Solution

The fourth proportional to 86,532.69, 129,706.70 and 39,142.83 is: 58,672.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,532.69 : 129,706.70 = 39,142.83 : x
  2. Step 2: Convert to fraction form
    86,532.69/129,706.70 = 39,142.83/x
  3. Step 3: Cross multiply
    86,532.69x = 129,706.70 × 39,142.83
  4. Step 4: Simplify right side
    86,532.69x = 5,077,087,307.96
  5. Step 5: Solve for x
    x = 5,077,087,307.96/86,532.69
  6. Step 6: Final answer
    x = 58,672.48

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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.