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Finding the Fourth Proportional to 139,065.54, 191,922.32 and 78,646.92

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Solution

The fourth proportional to 139,065.54, 191,922.32 and 78,646.92 is: 108,539.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,065.54 : 191,922.32 = 78,646.92 : x
  2. Step 2: Convert to fraction form
    139,065.54/191,922.32 = 78,646.92/x
  3. Step 3: Cross multiply
    139,065.54x = 191,922.32 × 78,646.92
  4. Step 4: Simplify right side
    139,065.54x = 15,094,099,347.25
  5. Step 5: Solve for x
    x = 15,094,099,347.25/139,065.54
  6. Step 6: Final answer
    x = 108,539.47

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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.