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Finding the Fourth Proportional to 72,719, 100,380.80 and 45,856.16

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Solution

The fourth proportional to 72,719, 100,380.80 and 45,856.16 is: 63,299.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,719 : 100,380.80 = 45,856.16 : x
  2. Step 2: Convert to fraction form
    72,719/100,380.80 = 45,856.16/x
  3. Step 3: Cross multiply
    72,719x = 100,380.80 × 45,856.16
  4. Step 4: Simplify right side
    72,719x = 4,603,078,025.73
  5. Step 5: Solve for x
    x = 4,603,078,025.73/72,719
  6. Step 6: Final answer
    x = 63,299.52

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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.