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Finding the Fourth Proportional to 90,811.72, 125,319.48 and 49,978.20

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Solution

The fourth proportional to 90,811.72, 125,319.48 and 49,978.20 is: 68,969.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,811.72 : 125,319.48 = 49,978.20 : x
  2. Step 2: Convert to fraction form
    90,811.72/125,319.48 = 49,978.20/x
  3. Step 3: Cross multiply
    90,811.72x = 125,319.48 × 49,978.20
  4. Step 4: Simplify right side
    90,811.72x = 6,263,242,035.34
  5. Step 5: Solve for x
    x = 6,263,242,035.34/90,811.72
  6. Step 6: Final answer
    x = 68,969.53

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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.