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Finding the Fourth Proportional to 84,291.80, 126,499.91 and 39,918.47

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Solution

The fourth proportional to 84,291.80, 126,499.91 and 39,918.47 is: 59,907.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,291.80 : 126,499.91 = 39,918.47 : x
  2. Step 2: Convert to fraction form
    84,291.80/126,499.91 = 39,918.47/x
  3. Step 3: Cross multiply
    84,291.80x = 126,499.91 × 39,918.47
  4. Step 4: Simplify right side
    84,291.80x = 5,049,682,030.25
  5. Step 5: Solve for x
    x = 5,049,682,030.25/84,291.80
  6. Step 6: Final answer
    x = 59,907.16

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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.