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Finding the Fourth Proportional to 158,358.78, 218,535.39 and 86,738.94

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Solution

The fourth proportional to 158,358.78, 218,535.39 and 86,738.94 is: 119,699.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,358.78 : 218,535.39 = 86,738.94 : x
  2. Step 2: Convert to fraction form
    158,358.78/218,535.39 = 86,738.94/x
  3. Step 3: Cross multiply
    158,358.78x = 218,535.39 × 86,738.94
  4. Step 4: Simplify right side
    158,358.78x = 18,955,528,081.09
  5. Step 5: Solve for x
    x = 18,955,528,081.09/158,358.78
  6. Step 6: Final answer
    x = 119,699.89

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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.