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Finding the Fourth Proportional to 39,740, 59,519.28 and 18,978.08

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Solution

The fourth proportional to 39,740, 59,519.28 and 18,978.08 is: 28,423.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,740 : 59,519.28 = 18,978.08 : x
  2. Step 2: Convert to fraction form
    39,740/59,519.28 = 18,978.08/x
  3. Step 3: Cross multiply
    39,740x = 59,519.28 × 18,978.08
  4. Step 4: Simplify right side
    39,740x = 1,129,561,657.38
  5. Step 5: Solve for x
    x = 1,129,561,657.38/39,740
  6. Step 6: Final answer
    x = 28,423.80

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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.