Home / 81,090.34-121,636.01-53,187.63

Finding the Fourth Proportional to 81,090.34, 121,636.01 and 53,187.63

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Solution

The fourth proportional to 81,090.34, 121,636.01 and 53,187.63 is: 79,781.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,090.34 : 121,636.01 = 53,187.63 : x
  2. Step 2: Convert to fraction form
    81,090.34/121,636.01 = 53,187.63/x
  3. Step 3: Cross multiply
    81,090.34x = 121,636.01 × 53,187.63
  4. Step 4: Simplify right side
    81,090.34x = 6,469,531,227.53
  5. Step 5: Solve for x
    x = 6,469,531,227.53/81,090.34
  6. Step 6: Final answer
    x = 79,781.78

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1.5x scale

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.