Home / 143,249.71-197,690.10-78,721.67

Finding the Fourth Proportional to 143,249.71, 197,690.10 and 78,721.67

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Solution

The fourth proportional to 143,249.71, 197,690.10 and 78,721.67 is: 108,638.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,249.71 : 197,690.10 = 78,721.67 : x
  2. Step 2: Convert to fraction form
    143,249.71/197,690.10 = 78,721.67/x
  3. Step 3: Cross multiply
    143,249.71x = 197,690.10 × 78,721.67
  4. Step 4: Simplify right side
    143,249.71x = 15,562,494,814.47
  5. Step 5: Solve for x
    x = 15,562,494,814.47/143,249.71
  6. Step 6: Final answer
    x = 108,638.93

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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.