Home / 138,622.51-191,291.10-78,189.55

Finding the Fourth Proportional to 138,622.51, 191,291.10 and 78,189.55

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Solution

The fourth proportional to 138,622.51, 191,291.10 and 78,189.55 is: 107,897.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,622.51 : 191,291.10 = 78,189.55 : x
  2. Step 2: Convert to fraction form
    138,622.51/191,291.10 = 78,189.55/x
  3. Step 3: Cross multiply
    138,622.51x = 191,291.10 × 78,189.55
  4. Step 4: Simplify right side
    138,622.51x = 14,956,965,028.01
  5. Step 5: Solve for x
    x = 14,956,965,028.01/138,622.51
  6. Step 6: Final answer
    x = 107,897.09

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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.