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Finding the Fourth Proportional to 142,645.74, 196,842.51 and 78,979.74

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Solution

The fourth proportional to 142,645.74, 196,842.51 and 78,979.74 is: 108,987.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,645.74 : 196,842.51 = 78,979.74 : x
  2. Step 2: Convert to fraction form
    142,645.74/196,842.51 = 78,979.74/x
  3. Step 3: Cross multiply
    142,645.74x = 196,842.51 × 78,979.74
  4. Step 4: Simplify right side
    142,645.74x = 15,546,570,260.75
  5. Step 5: Solve for x
    x = 15,546,570,260.75/142,645.74
  6. Step 6: Final answer
    x = 108,987.27

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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.