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Finding the Fourth Proportional to 40,007.79, 59,978.07 and 18,935.64

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Solution

The fourth proportional to 40,007.79, 59,978.07 and 18,935.64 is: 28,387.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,007.79 : 59,978.07 = 18,935.64 : x
  2. Step 2: Convert to fraction form
    40,007.79/59,978.07 = 18,935.64/x
  3. Step 3: Cross multiply
    40,007.79x = 59,978.07 × 18,935.64
  4. Step 4: Simplify right side
    40,007.79x = 1,135,723,141.41
  5. Step 5: Solve for x
    x = 1,135,723,141.41/40,007.79
  6. Step 6: Final answer
    x = 28,387.55

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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.