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Finding the Fourth Proportional to 128,293.40, 191,921.70 and 110,955.80

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Solution

The fourth proportional to 128,293.40, 191,921.70 and 110,955.80 is: 165,985.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,293.40 : 191,921.70 = 110,955.80 : x
  2. Step 2: Convert to fraction form
    128,293.40/191,921.70 = 110,955.80/x
  3. Step 3: Cross multiply
    128,293.40x = 191,921.70 × 110,955.80
  4. Step 4: Simplify right side
    128,293.40x = 21,294,825,760.86
  5. Step 5: Solve for x
    x = 21,294,825,760.86/128,293.40
  6. Step 6: Final answer
    x = 165,985.36

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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.