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Finding the Fourth Proportional to 84,816.80, 127,225.20 and 77,040.80

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Solution

The fourth proportional to 84,816.80, 127,225.20 and 77,040.80 is: 115,561.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,816.80 : 127,225.20 = 77,040.80 : x
  2. Step 2: Convert to fraction form
    84,816.80/127,225.20 = 77,040.80/x
  3. Step 3: Cross multiply
    84,816.80x = 127,225.20 × 77,040.80
  4. Step 4: Simplify right side
    84,816.80x = 9,801,531,188.16
  5. Step 5: Solve for x
    x = 9,801,531,188.16/84,816.80
  6. Step 6: Final answer
    x = 115,561.20

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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.