Home / 142,119.77-196,120.14-78,456.20

Finding the Fourth Proportional to 142,119.77, 196,120.14 and 78,456.20

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Solution

The fourth proportional to 142,119.77, 196,120.14 and 78,456.20 is: 108,266.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,119.77 : 196,120.14 = 78,456.20 : x
  2. Step 2: Convert to fraction form
    142,119.77/196,120.14 = 78,456.20/x
  3. Step 3: Cross multiply
    142,119.77x = 196,120.14 × 78,456.20
  4. Step 4: Simplify right side
    142,119.77x = 15,386,839,653.06
  5. Step 5: Solve for x
    x = 15,386,839,653.06/142,119.77
  6. Step 6: Final answer
    x = 108,266.71

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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.