Home / 142,120.77-196,121.52-78,457.20

Finding the Fourth Proportional to 142,120.77, 196,121.52 and 78,457.20

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Solution

The fourth proportional to 142,120.77, 196,121.52 and 78,457.20 is: 108,268.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,120.77 : 196,121.52 = 78,457.20 : x
  2. Step 2: Convert to fraction form
    142,120.77/196,121.52 = 78,457.20/x
  3. Step 3: Cross multiply
    142,120.77x = 196,121.52 × 78,457.20
  4. Step 4: Simplify right side
    142,120.77x = 15,387,145,318.94
  5. Step 5: Solve for x
    x = 15,387,145,318.94/142,120.77
  6. Step 6: Final answer
    x = 108,268.10

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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.