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Finding the Fourth Proportional to 139,228.32, 191,989.80 and 82,628.76

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Solution

The fourth proportional to 139,228.32, 191,989.80 and 82,628.76 is: 113,941.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,228.32 : 191,989.80 = 82,628.76 : x
  2. Step 2: Convert to fraction form
    139,228.32/191,989.80 = 82,628.76/x
  3. Step 3: Cross multiply
    139,228.32x = 191,989.80 × 82,628.76
  4. Step 4: Simplify right side
    139,228.32x = 15,863,879,106.65
  5. Step 5: Solve for x
    x = 15,863,879,106.65/139,228.32
  6. Step 6: Final answer
    x = 113,941.47

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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.