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Finding the Fourth Proportional to 90,027.86, 123,879.88 and 87,288.64

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Solution

The fourth proportional to 90,027.86, 123,879.88 and 87,288.64 is: 120,110.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,027.86 : 123,879.88 = 87,288.64 : x
  2. Step 2: Convert to fraction form
    90,027.86/123,879.88 = 87,288.64/x
  3. Step 3: Cross multiply
    90,027.86x = 123,879.88 × 87,288.64
  4. Step 4: Simplify right side
    90,027.86x = 10,813,306,047.97
  5. Step 5: Solve for x
    x = 10,813,306,047.97/90,027.86
  6. Step 6: Final answer
    x = 120,110.67

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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.