Home / 138,900.11-191,670.79-78,476

Finding the Fourth Proportional to 138,900.11, 191,670.79 and 78,476

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Solution

The fourth proportional to 138,900.11, 191,670.79 and 78,476 is: 108,290.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,900.11 : 191,670.79 = 78,476 : x
  2. Step 2: Convert to fraction form
    138,900.11/191,670.79 = 78,476/x
  3. Step 3: Cross multiply
    138,900.11x = 191,670.79 × 78,476
  4. Step 4: Simplify right side
    138,900.11x = 15,041,556,523.66
  5. Step 5: Solve for x
    x = 15,041,556,523.66/138,900.11
  6. Step 6: Final answer
    x = 108,290.46

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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.