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Finding the Fourth Proportional to 127,978.80, 191,968.20 and 61,407.60

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Solution

The fourth proportional to 127,978.80, 191,968.20 and 61,407.60 is: 92,111.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,978.80 : 191,968.20 = 61,407.60 : x
  2. Step 2: Convert to fraction form
    127,978.80/191,968.20 = 61,407.60/x
  3. Step 3: Cross multiply
    127,978.80x = 191,968.20 × 61,407.60
  4. Step 4: Simplify right side
    127,978.80x = 11,788,306,438.32
  5. Step 5: Solve for x
    x = 11,788,306,438.32/127,978.80
  6. Step 6: Final answer
    x = 92,111.40

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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.