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Finding the Fourth Proportional to 135,398.89, 186,860.98 and 74,975.15

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Solution

The fourth proportional to 135,398.89, 186,860.98 and 74,975.15 is: 103,471.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,398.89 : 186,860.98 = 74,975.15 : x
  2. Step 2: Convert to fraction form
    135,398.89/186,860.98 = 74,975.15/x
  3. Step 3: Cross multiply
    135,398.89x = 186,860.98 × 74,975.15
  4. Step 4: Simplify right side
    135,398.89x = 14,009,930,004.65
  5. Step 5: Solve for x
    x = 14,009,930,004.65/135,398.89
  6. Step 6: Final answer
    x = 103,471.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.