Home / 128,815.67-177,767.45-77,821.31

Finding the Fourth Proportional to 128,815.67, 177,767.45 and 77,821.31

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Solution

The fourth proportional to 128,815.67, 177,767.45 and 77,821.31 is: 107,394.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,815.67 : 177,767.45 = 77,821.31 : x
  2. Step 2: Convert to fraction form
    128,815.67/177,767.45 = 77,821.31/x
  3. Step 3: Cross multiply
    128,815.67x = 177,767.45 × 77,821.31
  4. Step 4: Simplify right side
    128,815.67x = 13,834,094,556.42
  5. Step 5: Solve for x
    x = 13,834,094,556.42/128,815.67
  6. Step 6: Final answer
    x = 107,394.50

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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.