Home / 138,942.27-191,669.90-87,868.94

Finding the Fourth Proportional to 138,942.27, 191,669.90 and 87,868.94

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Solution

The fourth proportional to 138,942.27, 191,669.90 and 87,868.94 is: 121,214.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,942.27 : 191,669.90 = 87,868.94 : x
  2. Step 2: Convert to fraction form
    138,942.27/191,669.90 = 87,868.94/x
  3. Step 3: Cross multiply
    138,942.27x = 191,669.90 × 87,868.94
  4. Step 4: Simplify right side
    138,942.27x = 16,841,829,545.21
  5. Step 5: Solve for x
    x = 16,841,829,545.21/138,942.27
  6. Step 6: Final answer
    x = 121,214.58

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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.