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Finding the Fourth Proportional to 79,389.64, 119,142.78 and 39,907

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Solution

The fourth proportional to 79,389.64, 119,142.78 and 39,907 is: 59,889.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,389.64 : 119,142.78 = 39,907 : x
  2. Step 2: Convert to fraction form
    79,389.64/119,142.78 = 39,907/x
  3. Step 3: Cross multiply
    79,389.64x = 119,142.78 × 39,907
  4. Step 4: Simplify right side
    79,389.64x = 4,754,630,921.46
  5. Step 5: Solve for x
    x = 4,754,630,921.46/79,389.64
  6. Step 6: Final answer
    x = 59,889.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.