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Finding the Fourth Proportional to 86,220.40, 129,427.80 and 51,179.80

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Solution

The fourth proportional to 86,220.40, 129,427.80 and 51,179.80 is: 76,827.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,220.40 : 129,427.80 = 51,179.80 : x
  2. Step 2: Convert to fraction form
    86,220.40/129,427.80 = 51,179.80/x
  3. Step 3: Cross multiply
    86,220.40x = 129,427.80 × 51,179.80
  4. Step 4: Simplify right side
    86,220.40x = 6,624,088,918.44
  5. Step 5: Solve for x
    x = 6,624,088,918.44/86,220.40
  6. Step 6: Final answer
    x = 76,827.40

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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.