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Finding the Fourth Proportional to 127,985.60, 191,978.40 and 71,998.40

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Solution

The fourth proportional to 127,985.60, 191,978.40 and 71,998.40 is: 107,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,985.60 : 191,978.40 = 71,998.40 : x
  2. Step 2: Convert to fraction form
    127,985.60/191,978.40 = 71,998.40/x
  3. Step 3: Cross multiply
    127,985.60x = 191,978.40 × 71,998.40
  4. Step 4: Simplify right side
    127,985.60x = 13,822,137,634.56
  5. Step 5: Solve for x
    x = 13,822,137,634.56/127,985.60
  6. Step 6: Final answer
    x = 107,997.60

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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.