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Finding the Fourth Proportional to 121,400.76, 167,611.50 and 85,036.98

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Solution

The fourth proportional to 121,400.76, 167,611.50 and 85,036.98 is: 117,405.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,400.76 : 167,611.50 = 85,036.98 : x
  2. Step 2: Convert to fraction form
    121,400.76/167,611.50 = 85,036.98/x
  3. Step 3: Cross multiply
    121,400.76x = 167,611.50 × 85,036.98
  4. Step 4: Simplify right side
    121,400.76x = 14,253,175,773.27
  5. Step 5: Solve for x
    x = 14,253,175,773.27/121,400.76
  6. Step 6: Final answer
    x = 117,405.98

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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.