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Finding the Fourth Proportional to 258,828.32, 388,244.64 and 81,331.40

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Solution

The fourth proportional to 258,828.32, 388,244.64 and 81,331.40 is: 121,997.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,828.32 : 388,244.64 = 81,331.40 : x
  2. Step 2: Convert to fraction form
    258,828.32/388,244.64 = 81,331.40/x
  3. Step 3: Cross multiply
    258,828.32x = 388,244.64 × 81,331.40
  4. Step 4: Simplify right side
    258,828.32x = 31,576,480,113.70
  5. Step 5: Solve for x
    x = 31,576,480,113.70/258,828.32
  6. Step 6: Final answer
    x = 121,997.78

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1.5x scale

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.