Home / 127,979.60-191,969.40-85,989.20

Finding the Fourth Proportional to 127,979.60, 191,969.40 and 85,989.20

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Solution

The fourth proportional to 127,979.60, 191,969.40 and 85,989.20 is: 128,983.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,979.60 : 191,969.40 = 85,989.20 : x
  2. Step 2: Convert to fraction form
    127,979.60/191,969.40 = 85,989.20/x
  3. Step 3: Cross multiply
    127,979.60x = 191,969.40 × 85,989.20
  4. Step 4: Simplify right side
    127,979.60x = 16,507,295,130.48
  5. Step 5: Solve for x
    x = 16,507,295,130.48/127,979.60
  6. Step 6: Final answer
    x = 128,983.80

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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.