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Finding the Fourth Proportional to 100,886.85, 139,228.47 and 57,879.09

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Solution

The fourth proportional to 100,886.85, 139,228.47 and 57,879.09 is: 79,875.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,886.85 : 139,228.47 = 57,879.09 : x
  2. Step 2: Convert to fraction form
    100,886.85/139,228.47 = 57,879.09/x
  3. Step 3: Cross multiply
    100,886.85x = 139,228.47 × 57,879.09
  4. Step 4: Simplify right side
    100,886.85x = 8,058,417,145.69
  5. Step 5: Solve for x
    x = 8,058,417,145.69/100,886.85
  6. Step 6: Final answer
    x = 79,875.79

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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.