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Finding the Fourth Proportional to 100,712.99, 138,987.75 and 55,393.08

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Solution

The fourth proportional to 100,712.99, 138,987.75 and 55,393.08 is: 76,444.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,712.99 : 138,987.75 = 55,393.08 : x
  2. Step 2: Convert to fraction form
    100,712.99/138,987.75 = 55,393.08/x
  3. Step 3: Cross multiply
    100,712.99x = 138,987.75 × 55,393.08
  4. Step 4: Simplify right side
    100,712.99x = 7,698,959,554.77
  5. Step 5: Solve for x
    x = 7,698,959,554.77/100,712.99
  6. Step 6: Final answer
    x = 76,444.56

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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.