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Finding the Fourth Proportional to 142,790.80, 197,051.80 and 79,129.68

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Solution

The fourth proportional to 142,790.80, 197,051.80 and 79,129.68 is: 109,199.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,790.80 : 197,051.80 = 79,129.68 : x
  2. Step 2: Convert to fraction form
    142,790.80/197,051.80 = 79,129.68/x
  3. Step 3: Cross multiply
    142,790.80x = 197,051.80 × 79,129.68
  4. Step 4: Simplify right side
    142,790.80x = 15,592,645,877.42
  5. Step 5: Solve for x
    x = 15,592,645,877.42/142,790.80
  6. Step 6: Final answer
    x = 109,199.23

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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.