Home / 138,039.12-190,499.45-80,715.42

Finding the Fourth Proportional to 138,039.12, 190,499.45 and 80,715.42

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Solution

The fourth proportional to 138,039.12, 190,499.45 and 80,715.42 is: 111,390.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,039.12 : 190,499.45 = 80,715.42 : x
  2. Step 2: Convert to fraction form
    138,039.12/190,499.45 = 80,715.42/x
  3. Step 3: Cross multiply
    138,039.12x = 190,499.45 × 80,715.42
  4. Step 4: Simplify right side
    138,039.12x = 15,376,242,712.94
  5. Step 5: Solve for x
    x = 15,376,242,712.94/138,039.12
  6. Step 6: Final answer
    x = 111,390.47

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1.5x scale

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.