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Finding the Fourth Proportional to 128,522.70, 192,784.05 and 39,803.40

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Solution

The fourth proportional to 128,522.70, 192,784.05 and 39,803.40 is: 59,705.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,522.70 : 192,784.05 = 39,803.40 : x
  2. Step 2: Convert to fraction form
    128,522.70/192,784.05 = 39,803.40/x
  3. Step 3: Cross multiply
    128,522.70x = 192,784.05 × 39,803.40
  4. Step 4: Simplify right side
    128,522.70x = 7,673,460,655.77
  5. Step 5: Solve for x
    x = 7,673,460,655.77/128,522.70
  6. Step 6: Final answer
    x = 59,705.10

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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.