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Finding the Fourth Proportional to 38,978.87, 58,459.91 and 12,326.94

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Solution

The fourth proportional to 38,978.87, 58,459.91 and 12,326.94 is: 18,487.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,978.87 : 58,459.91 = 12,326.94 : x
  2. Step 2: Convert to fraction form
    38,978.87/58,459.91 = 12,326.94/x
  3. Step 3: Cross multiply
    38,978.87x = 58,459.91 × 12,326.94
  4. Step 4: Simplify right side
    38,978.87x = 720,631,741.34
  5. Step 5: Solve for x
    x = 720,631,741.34/38,978.87
  6. Step 6: Final answer
    x = 18,487.76

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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.