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Finding the Fourth Proportional to 117,221.16, 161,705.72 and 74,128.04

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Solution

The fourth proportional to 117,221.16, 161,705.72 and 74,128.04 is: 102,259.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,221.16 : 161,705.72 = 74,128.04 : x
  2. Step 2: Convert to fraction form
    117,221.16/161,705.72 = 74,128.04/x
  3. Step 3: Cross multiply
    117,221.16x = 161,705.72 × 74,128.04
  4. Step 4: Simplify right side
    117,221.16x = 11,986,926,901.22
  5. Step 5: Solve for x
    x = 11,986,926,901.22/117,221.16
  6. Step 6: Final answer
    x = 102,259.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.