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Finding the Fourth Proportional to 79,487.88, 119,219.06 and 20,320.40

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Solution

The fourth proportional to 79,487.88, 119,219.06 and 20,320.40 is: 30,477.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,487.88 : 119,219.06 = 20,320.40 : x
  2. Step 2: Convert to fraction form
    79,487.88/119,219.06 = 20,320.40/x
  3. Step 3: Cross multiply
    79,487.88x = 119,219.06 × 20,320.40
  4. Step 4: Simplify right side
    79,487.88x = 2,422,578,986.82
  5. Step 5: Solve for x
    x = 2,422,578,986.82/79,487.88
  6. Step 6: Final answer
    x = 30,477.34

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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.