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Finding the Fourth Proportional to 127,988.40, 191,982.60 and 81,447.60

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Solution

The fourth proportional to 127,988.40, 191,982.60 and 81,447.60 is: 122,171.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,988.40 : 191,982.60 = 81,447.60 : x
  2. Step 2: Convert to fraction form
    127,988.40/191,982.60 = 81,447.60/x
  3. Step 3: Cross multiply
    127,988.40x = 191,982.60 × 81,447.60
  4. Step 4: Simplify right side
    127,988.40x = 15,636,522,011.76
  5. Step 5: Solve for x
    x = 15,636,522,011.76/127,988.40
  6. Step 6: Final answer
    x = 122,171.40

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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.