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Finding the Fourth Proportional to 79,787.77, 119,681.29 and 20,618.41

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Solution

The fourth proportional to 79,787.77, 119,681.29 and 20,618.41 is: 30,927.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,787.77 : 119,681.29 = 20,618.41 : x
  2. Step 2: Convert to fraction form
    79,787.77/119,681.29 = 20,618.41/x
  3. Step 3: Cross multiply
    79,787.77x = 119,681.29 × 20,618.41
  4. Step 4: Simplify right side
    79,787.77x = 2,467,637,906.55
  5. Step 5: Solve for x
    x = 2,467,637,906.55/79,787.77
  6. Step 6: Final answer
    x = 30,927.52

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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.