Home / 100,689.12-138,954.48-55,368.96

Finding the Fourth Proportional to 100,689.12, 138,954.48 and 55,368.96

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Solution

The fourth proportional to 100,689.12, 138,954.48 and 55,368.96 is: 76,411.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,689.12 : 138,954.48 = 55,368.96 : x
  2. Step 2: Convert to fraction form
    100,689.12/138,954.48 = 55,368.96/x
  3. Step 3: Cross multiply
    100,689.12x = 138,954.48 × 55,368.96
  4. Step 4: Simplify right side
    100,689.12x = 7,693,765,044.94
  5. Step 5: Solve for x
    x = 7,693,765,044.94/100,689.12
  6. Step 6: Final answer
    x = 76,411.09

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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.