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Finding the Fourth Proportional to 128,655.90, 193,093.20 and 103,724.10

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Solution

The fourth proportional to 128,655.90, 193,093.20 and 103,724.10 is: 155,674.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,655.90 : 193,093.20 = 103,724.10 : x
  2. Step 2: Convert to fraction form
    128,655.90/193,093.20 = 103,724.10/x
  3. Step 3: Cross multiply
    128,655.90x = 193,093.20 × 103,724.10
  4. Step 4: Simplify right side
    128,655.90x = 20,028,418,386.12
  5. Step 5: Solve for x
    x = 20,028,418,386.12/128,655.90
  6. Step 6: Final answer
    x = 155,674.31

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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.