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Finding the Fourth Proportional to 139,642.08, 209,388.60 and 72,920.76

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Solution

The fourth proportional to 139,642.08, 209,388.60 and 72,920.76 is: 109,342.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,642.08 : 209,388.60 = 72,920.76 : x
  2. Step 2: Convert to fraction form
    139,642.08/209,388.60 = 72,920.76/x
  3. Step 3: Cross multiply
    139,642.08x = 209,388.60 × 72,920.76
  4. Step 4: Simplify right side
    139,642.08x = 15,268,775,847.34
  5. Step 5: Solve for x
    x = 15,268,775,847.34/139,642.08
  6. Step 6: Final answer
    x = 109,342.23

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1.5x scale

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.