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Finding the Fourth Proportional to 143,390.16, 197,877.96 and 79,728

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Solution

The fourth proportional to 143,390.16, 197,877.96 and 79,728 is: 110,024.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,390.16 : 197,877.96 = 79,728 : x
  2. Step 2: Convert to fraction form
    143,390.16/197,877.96 = 79,728/x
  3. Step 3: Cross multiply
    143,390.16x = 197,877.96 × 79,728
  4. Step 4: Simplify right side
    143,390.16x = 15,776,413,994.88
  5. Step 5: Solve for x
    x = 15,776,413,994.88/143,390.16
  6. Step 6: Final answer
    x = 110,024.38

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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.