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Finding the Fourth Proportional to 171,428.40, 257,434.20 and 127,105.20

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Solution

The fourth proportional to 171,428.40, 257,434.20 and 127,105.20 is: 190,874.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,428.40 : 257,434.20 = 127,105.20 : x
  2. Step 2: Convert to fraction form
    171,428.40/257,434.20 = 127,105.20/x
  3. Step 3: Cross multiply
    171,428.40x = 257,434.20 × 127,105.20
  4. Step 4: Simplify right side
    171,428.40x = 32,721,225,477.84
  5. Step 5: Solve for x
    x = 32,721,225,477.84/171,428.40
  6. Step 6: Final answer
    x = 190,874.01

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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.