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Finding the Fourth Proportional to 39,786.60, 59,699.10 and 28,074.60

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Solution

The fourth proportional to 39,786.60, 59,699.10 and 28,074.60 is: 42,125.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,786.60 : 59,699.10 = 28,074.60 : x
  2. Step 2: Convert to fraction form
    39,786.60/59,699.10 = 28,074.60/x
  3. Step 3: Cross multiply
    39,786.60x = 59,699.10 × 28,074.60
  4. Step 4: Simplify right side
    39,786.60x = 1,676,028,352.86
  5. Step 5: Solve for x
    x = 1,676,028,352.86/39,786.60
  6. Step 6: Final answer
    x = 42,125.45

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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.