Home / 142,290.21-196,372.92-78,640.31

Finding the Fourth Proportional to 142,290.21, 196,372.92 and 78,640.31

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Solution

The fourth proportional to 142,290.21, 196,372.92 and 78,640.31 is: 108,530.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,290.21 : 196,372.92 = 78,640.31 : x
  2. Step 2: Convert to fraction form
    142,290.21/196,372.92 = 78,640.31/x
  3. Step 3: Cross multiply
    142,290.21x = 196,372.92 × 78,640.31
  4. Step 4: Simplify right side
    142,290.21x = 15,442,825,929.34
  5. Step 5: Solve for x
    x = 15,442,825,929.34/142,290.21
  6. Step 6: Final answer
    x = 108,530.49

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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.