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Finding the Fourth Proportional to 99,290.79, 137,021.47 and 53,968.65

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Solution

The fourth proportional to 99,290.79, 137,021.47 and 53,968.65 is: 74,476.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,290.79 : 137,021.47 = 53,968.65 : x
  2. Step 2: Convert to fraction form
    99,290.79/137,021.47 = 53,968.65/x
  3. Step 3: Cross multiply
    99,290.79x = 137,021.47 × 53,968.65
  4. Step 4: Simplify right side
    99,290.79x = 7,394,864,108.56
  5. Step 5: Solve for x
    x = 7,394,864,108.56/99,290.79
  6. Step 6: Final answer
    x = 74,476.84

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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.