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Finding the Fourth Proportional to 81,279.20, 121,918.80 and 39,807.20

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Solution

The fourth proportional to 81,279.20, 121,918.80 and 39,807.20 is: 59,710.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.20 : 121,918.80 = 39,807.20 : x
  2. Step 2: Convert to fraction form
    81,279.20/121,918.80 = 39,807.20/x
  3. Step 3: Cross multiply
    81,279.20x = 121,918.80 × 39,807.20
  4. Step 4: Simplify right side
    81,279.20x = 4,853,246,055.36
  5. Step 5: Solve for x
    x = 4,853,246,055.36/81,279.20
  6. Step 6: Final answer
    x = 59,710.80

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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.