Home / 138,192.30-190,688.40-87,185.79

Finding the Fourth Proportional to 138,192.30, 190,688.40 and 87,185.79

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Solution

The fourth proportional to 138,192.30, 190,688.40 and 87,185.79 is: 120,305.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,192.30 : 190,688.40 = 87,185.79 : x
  2. Step 2: Convert to fraction form
    138,192.30/190,688.40 = 87,185.79/x
  3. Step 3: Cross multiply
    138,192.30x = 190,688.40 × 87,185.79
  4. Step 4: Simplify right side
    138,192.30x = 16,625,318,797.84
  5. Step 5: Solve for x
    x = 16,625,318,797.84/138,192.30
  6. Step 6: Final answer
    x = 120,305.68

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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.