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Finding the Fourth Proportional to 142,654.49, 196,860.79 and 78,990.92

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Solution

The fourth proportional to 142,654.49, 196,860.79 and 78,990.92 is: 109,006.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,654.49 : 196,860.79 = 78,990.92 : x
  2. Step 2: Convert to fraction form
    142,654.49/196,860.79 = 78,990.92/x
  3. Step 3: Cross multiply
    142,654.49x = 196,860.79 × 78,990.92
  4. Step 4: Simplify right side
    142,654.49x = 15,550,215,431.44
  5. Step 5: Solve for x
    x = 15,550,215,431.44/142,654.49
  6. Step 6: Final answer
    x = 109,006.14

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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.