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Finding the Fourth Proportional to 127,918.80, 191,705.40 and 85,678.80

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Solution

The fourth proportional to 127,918.80, 191,705.40 and 85,678.80 is: 128,402.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,918.80 : 191,705.40 = 85,678.80 : x
  2. Step 2: Convert to fraction form
    127,918.80/191,705.40 = 85,678.80/x
  3. Step 3: Cross multiply
    127,918.80x = 191,705.40 × 85,678.80
  4. Step 4: Simplify right side
    127,918.80x = 16,425,088,625.52
  5. Step 5: Solve for x
    x = 16,425,088,625.52/127,918.80
  6. Step 6: Final answer
    x = 128,402.46

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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.