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Finding the Fourth Proportional to 86,598.90, 129,898.35 and 81,414.90

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Solution

The fourth proportional to 86,598.90, 129,898.35 and 81,414.90 is: 122,122.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,598.90 : 129,898.35 = 81,414.90 : x
  2. Step 2: Convert to fraction form
    86,598.90/129,898.35 = 81,414.90/x
  3. Step 3: Cross multiply
    86,598.90x = 129,898.35 × 81,414.90
  4. Step 4: Simplify right side
    86,598.90x = 10,575,661,175.42
  5. Step 5: Solve for x
    x = 10,575,661,175.42/86,598.90
  6. Step 6: Final answer
    x = 122,122.35

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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.