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Finding the Fourth Proportional to 158,218.31, 218,339.58 and 85,619.60

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Solution

The fourth proportional to 158,218.31, 218,339.58 and 85,619.60 is: 118,154.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,218.31 : 218,339.58 = 85,619.60 : x
  2. Step 2: Convert to fraction form
    158,218.31/218,339.58 = 85,619.60/x
  3. Step 3: Cross multiply
    158,218.31x = 218,339.58 × 85,619.60
  4. Step 4: Simplify right side
    158,218.31x = 18,694,146,412.07
  5. Step 5: Solve for x
    x = 18,694,146,412.07/158,218.31
  6. Step 6: Final answer
    x = 118,154.13

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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.