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Finding the Fourth Proportional to 86,899, 119,920.68 and 47,155

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Solution

The fourth proportional to 86,899, 119,920.68 and 47,155 is: 65,073.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,899 : 119,920.68 = 47,155 : x
  2. Step 2: Convert to fraction form
    86,899/119,920.68 = 47,155/x
  3. Step 3: Cross multiply
    86,899x = 119,920.68 × 47,155
  4. Step 4: Simplify right side
    86,899x = 5,654,859,665.40
  5. Step 5: Solve for x
    x = 5,654,859,665.40/86,899
  6. Step 6: Final answer
    x = 65,073.93

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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.