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Finding the Fourth Proportional to 115,164, 158,979.60 and 81,200.16

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Solution

The fourth proportional to 115,164, 158,979.60 and 81,200.16 is: 112,093.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,164 : 158,979.60 = 81,200.16 : x
  2. Step 2: Convert to fraction form
    115,164/158,979.60 = 81,200.16/x
  3. Step 3: Cross multiply
    115,164x = 158,979.60 × 81,200.16
  4. Step 4: Simplify right side
    115,164x = 12,909,168,956.74
  5. Step 5: Solve for x
    x = 12,909,168,956.74/115,164
  6. Step 6: Final answer
    x = 112,093.79

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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.