Home / 81,929.78-122,864.92-28,606.78

Finding the Fourth Proportional to 81,929.78, 122,864.92 and 28,606.78

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Solution

The fourth proportional to 81,929.78, 122,864.92 and 28,606.78 is: 42,899.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,929.78 : 122,864.92 = 28,606.78 : x
  2. Step 2: Convert to fraction form
    81,929.78/122,864.92 = 28,606.78/x
  3. Step 3: Cross multiply
    81,929.78x = 122,864.92 × 28,606.78
  4. Step 4: Simplify right side
    81,929.78x = 3,514,769,818.22
  5. Step 5: Solve for x
    x = 3,514,769,818.22/81,929.78
  6. Step 6: Final answer
    x = 42,899.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.