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Finding the Fourth Proportional to 123,878.40, 170,952.16 and 67,289.72

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Solution

The fourth proportional to 123,878.40, 170,952.16 and 67,289.72 is: 92,859.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,878.40 : 170,952.16 = 67,289.72 : x
  2. Step 2: Convert to fraction form
    123,878.40/170,952.16 = 67,289.72/x
  3. Step 3: Cross multiply
    123,878.40x = 170,952.16 × 67,289.72
  4. Step 4: Simplify right side
    123,878.40x = 11,503,322,979.80
  5. Step 5: Solve for x
    x = 11,503,322,979.80/123,878.40
  6. Step 6: Final answer
    x = 92,859.80

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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.