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Finding the Fourth Proportional to 143,347.40, 197,815.54 and 79,687.88

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Solution

The fourth proportional to 143,347.40, 197,815.54 and 79,687.88 is: 109,967.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,347.40 : 197,815.54 = 79,687.88 : x
  2. Step 2: Convert to fraction form
    143,347.40/197,815.54 = 79,687.88/x
  3. Step 3: Cross multiply
    143,347.40x = 197,815.54 × 79,687.88
  4. Step 4: Simplify right side
    143,347.40x = 15,763,501,013.66
  5. Step 5: Solve for x
    x = 15,763,501,013.66/143,347.40
  6. Step 6: Final answer
    x = 109,967.12

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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.