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Finding the Fourth Proportional to 100,019.20, 149,875.20 and 86,809.60

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Solution

The fourth proportional to 100,019.20, 149,875.20 and 86,809.60 is: 130,081.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,019.20 : 149,875.20 = 86,809.60 : x
  2. Step 2: Convert to fraction form
    100,019.20/149,875.20 = 86,809.60/x
  3. Step 3: Cross multiply
    100,019.20x = 149,875.20 × 86,809.60
  4. Step 4: Simplify right side
    100,019.20x = 13,010,606,161.92
  5. Step 5: Solve for x
    x = 13,010,606,161.92/100,019.20
  6. Step 6: Final answer
    x = 130,081.09

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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.