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Finding the Fourth Proportional to 127,991.40, 191,962.80 and 39,247.80

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Solution

The fourth proportional to 127,991.40, 191,962.80 and 39,247.80 is: 58,864.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,991.40 : 191,962.80 = 39,247.80 : x
  2. Step 2: Convert to fraction form
    127,991.40/191,962.80 = 39,247.80/x
  3. Step 3: Cross multiply
    127,991.40x = 191,962.80 × 39,247.80
  4. Step 4: Simplify right side
    127,991.40x = 7,534,117,581.84
  5. Step 5: Solve for x
    x = 7,534,117,581.84/127,991.40
  6. Step 6: Final answer
    x = 58,864.25

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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.