Home / 78,721.29-108,634.68-42,911.28

Finding the Fourth Proportional to 78,721.29, 108,634.68 and 42,911.28

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Solution

The fourth proportional to 78,721.29, 108,634.68 and 42,911.28 is: 59,217.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.29 : 108,634.68 = 42,911.28 : x
  2. Step 2: Convert to fraction form
    78,721.29/108,634.68 = 42,911.28/x
  3. Step 3: Cross multiply
    78,721.29x = 108,634.68 × 42,911.28
  4. Step 4: Simplify right side
    78,721.29x = 4,661,653,171.19
  5. Step 5: Solve for x
    x = 4,661,653,171.19/78,721.29
  6. Step 6: Final answer
    x = 59,217.18

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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.