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Finding the Fourth Proportional to 165,508.40, 248,322.72 and 81,259.58

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Solution

The fourth proportional to 165,508.40, 248,322.72 and 81,259.58 is: 121,918.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,508.40 : 248,322.72 = 81,259.58 : x
  2. Step 2: Convert to fraction form
    165,508.40/248,322.72 = 81,259.58/x
  3. Step 3: Cross multiply
    165,508.40x = 248,322.72 × 81,259.58
  4. Step 4: Simplify right side
    165,508.40x = 20,178,599,931.66
  5. Step 5: Solve for x
    x = 20,178,599,931.66/165,508.40
  6. Step 6: Final answer
    x = 121,918.89

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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.