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Finding the Fourth Proportional to 129,043.40, 193,565.10 and 81,804.20

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Solution

The fourth proportional to 129,043.40, 193,565.10 and 81,804.20 is: 122,706.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,043.40 : 193,565.10 = 81,804.20 : x
  2. Step 2: Convert to fraction form
    129,043.40/193,565.10 = 81,804.20/x
  3. Step 3: Cross multiply
    129,043.40x = 193,565.10 × 81,804.20
  4. Step 4: Simplify right side
    129,043.40x = 15,834,438,153.42
  5. Step 5: Solve for x
    x = 15,834,438,153.42/129,043.40
  6. Step 6: Final answer
    x = 122,706.30

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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.