Home / 142,378.70-196,486.56-78,720.59

Finding the Fourth Proportional to 142,378.70, 196,486.56 and 78,720.59

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Solution

The fourth proportional to 142,378.70, 196,486.56 and 78,720.59 is: 108,636.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,378.70 : 196,486.56 = 78,720.59 : x
  2. Step 2: Convert to fraction form
    142,378.70/196,486.56 = 78,720.59/x
  3. Step 3: Cross multiply
    142,378.70x = 196,486.56 × 78,720.59
  4. Step 4: Simplify right side
    142,378.70x = 15,467,538,421.49
  5. Step 5: Solve for x
    x = 15,467,538,421.49/142,378.70
  6. Step 6: Final answer
    x = 108,636.61

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1.5x scale

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.