Home / 138,857.04-191,590.92-78,421.68

Finding the Fourth Proportional to 138,857.04, 191,590.92 and 78,421.68

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Solution

The fourth proportional to 138,857.04, 191,590.92 and 78,421.68 is: 108,203.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,857.04 : 191,590.92 = 78,421.68 : x
  2. Step 2: Convert to fraction form
    138,857.04/191,590.92 = 78,421.68/x
  3. Step 3: Cross multiply
    138,857.04x = 191,590.92 × 78,421.68
  4. Step 4: Simplify right side
    138,857.04x = 15,024,881,819.15
  5. Step 5: Solve for x
    x = 15,024,881,819.15/138,857.04
  6. Step 6: Final answer
    x = 108,203.96

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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.