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Finding the Fourth Proportional to 158,505.40, 218,736.06 and 86,885.20

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Solution

The fourth proportional to 158,505.40, 218,736.06 and 86,885.20 is: 119,900.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,505.40 : 218,736.06 = 86,885.20 : x
  2. Step 2: Convert to fraction form
    158,505.40/218,736.06 = 86,885.20/x
  3. Step 3: Cross multiply
    158,505.40x = 218,736.06 × 86,885.20
  4. Step 4: Simplify right side
    158,505.40x = 19,004,926,320.31
  5. Step 5: Solve for x
    x = 19,004,926,320.31/158,505.40
  6. Step 6: Final answer
    x = 119,900.81

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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.