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Finding the Fourth Proportional to 127,970.20, 191,955.30 and 85,979.80

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Solution

The fourth proportional to 127,970.20, 191,955.30 and 85,979.80 is: 128,969.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,970.20 : 191,955.30 = 85,979.80 : x
  2. Step 2: Convert to fraction form
    127,970.20/191,955.30 = 85,979.80/x
  3. Step 3: Cross multiply
    127,970.20x = 191,955.30 × 85,979.80
  4. Step 4: Simplify right side
    127,970.20x = 16,504,278,302.94
  5. Step 5: Solve for x
    x = 16,504,278,302.94/127,970.20
  6. Step 6: Final answer
    x = 128,969.70

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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.