Home / 81,311.49-121,967.37-53,407.80

Finding the Fourth Proportional to 81,311.49, 121,967.37 and 53,407.80

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Solution

The fourth proportional to 81,311.49, 121,967.37 and 53,407.80 is: 80,111.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,311.49 : 121,967.37 = 53,407.80 : x
  2. Step 2: Convert to fraction form
    81,311.49/121,967.37 = 53,407.80/x
  3. Step 3: Cross multiply
    81,311.49x = 121,967.37 × 53,407.80
  4. Step 4: Simplify right side
    81,311.49x = 6,514,008,903.49
  5. Step 5: Solve for x
    x = 6,514,008,903.49/81,311.49
  6. Step 6: Final answer
    x = 80,111.79

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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.