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Finding the Fourth Proportional to 128,787.12, 193,208.04 and 40,038.48

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Solution

The fourth proportional to 128,787.12, 193,208.04 and 40,038.48 is: 60,066.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.12 : 193,208.04 = 40,038.48 : x
  2. Step 2: Convert to fraction form
    128,787.12/193,208.04 = 40,038.48/x
  3. Step 3: Cross multiply
    128,787.12x = 193,208.04 × 40,038.48
  4. Step 4: Simplify right side
    128,787.12x = 7,735,756,245.38
  5. Step 5: Solve for x
    x = 7,735,756,245.38/128,787.12
  6. Step 6: Final answer
    x = 60,066.23

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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.