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Finding the Fourth Proportional to 50,978.96, 70,348.70 and 28,319.54

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Solution

The fourth proportional to 50,978.96, 70,348.70 and 28,319.54 is: 39,079.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    50,978.96 : 70,348.70 = 28,319.54 : x
  2. Step 2: Convert to fraction form
    50,978.96/70,348.70 = 28,319.54/x
  3. Step 3: Cross multiply
    50,978.96x = 70,348.70 × 28,319.54
  4. Step 4: Simplify right side
    50,978.96x = 1,992,242,823.60
  5. Step 5: Solve for x
    x = 1,992,242,823.60/50,978.96
  6. Step 6: Final answer
    x = 39,079.71

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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.