Home / 100,492.21-138,678.66-55,170.94

Finding the Fourth Proportional to 100,492.21, 138,678.66 and 55,170.94

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Solution

The fourth proportional to 100,492.21, 138,678.66 and 55,170.94 is: 76,135.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,492.21 : 138,678.66 = 55,170.94 : x
  2. Step 2: Convert to fraction form
    100,492.21/138,678.66 = 55,170.94/x
  3. Step 3: Cross multiply
    100,492.21x = 138,678.66 × 55,170.94
  4. Step 4: Simplify right side
    100,492.21x = 7,651,032,030.14
  5. Step 5: Solve for x
    x = 7,651,032,030.14/100,492.21
  6. Step 6: Final answer
    x = 76,135.57

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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.