Home / 76,780.32-105,976.64-49,989.76

Finding the Fourth Proportional to 76,780.32, 105,976.64 and 49,989.76

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Solution

The fourth proportional to 76,780.32, 105,976.64 and 49,989.76 is: 68,998.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,780.32 : 105,976.64 = 49,989.76 : x
  2. Step 2: Convert to fraction form
    76,780.32/105,976.64 = 49,989.76/x
  3. Step 3: Cross multiply
    76,780.32x = 105,976.64 × 49,989.76
  4. Step 4: Simplify right side
    76,780.32x = 5,297,746,799.21
  5. Step 5: Solve for x
    x = 5,297,746,799.21/76,780.32
  6. Step 6: Final answer
    x = 68,998.76

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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.