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Finding the Fourth Proportional to 128,918.20, 193,223.70 and 54,038.20

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Solution

The fourth proportional to 128,918.20, 193,223.70 and 54,038.20 is: 80,992.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,918.20 : 193,223.70 = 54,038.20 : x
  2. Step 2: Convert to fraction form
    128,918.20/193,223.70 = 54,038.20/x
  3. Step 3: Cross multiply
    128,918.20x = 193,223.70 × 54,038.20
  4. Step 4: Simplify right side
    128,918.20x = 10,441,460,945.34
  5. Step 5: Solve for x
    x = 10,441,460,945.34/128,918.20
  6. Step 6: Final answer
    x = 80,992.92

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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.