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Finding the Fourth Proportional to 39,405.69, 54,379.11 and 21,500.25

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Solution

The fourth proportional to 39,405.69, 54,379.11 and 21,500.25 is: 29,669.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,405.69 : 54,379.11 = 21,500.25 : x
  2. Step 2: Convert to fraction form
    39,405.69/54,379.11 = 21,500.25/x
  3. Step 3: Cross multiply
    39,405.69x = 54,379.11 × 21,500.25
  4. Step 4: Simplify right side
    39,405.69x = 1,169,164,459.78
  5. Step 5: Solve for x
    x = 1,169,164,459.78/39,405.69
  6. Step 6: Final answer
    x = 29,669.94

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1.5x scale

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.