Home / 81,178.24-121,710.12-31,216.36

Finding the Fourth Proportional to 81,178.24, 121,710.12 and 31,216.36

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Solution

The fourth proportional to 81,178.24, 121,710.12 and 31,216.36 is: 46,802.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,178.24 : 121,710.12 = 31,216.36 : x
  2. Step 2: Convert to fraction form
    81,178.24/121,710.12 = 31,216.36/x
  3. Step 3: Cross multiply
    81,178.24x = 121,710.12 × 31,216.36
  4. Step 4: Simplify right side
    81,178.24x = 3,799,346,921.56
  5. Step 5: Solve for x
    x = 3,799,346,921.56/81,178.24
  6. Step 6: Final answer
    x = 46,802.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.