Home / 21,015.54-31,430.30-18,691.79

Finding the Fourth Proportional to 21,015.54, 31,430.30 and 18,691.79

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Solution

The fourth proportional to 21,015.54, 31,430.30 and 18,691.79 is: 27,954.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,015.54 : 31,430.30 = 18,691.79 : x
  2. Step 2: Convert to fraction form
    21,015.54/31,430.30 = 18,691.79/x
  3. Step 3: Cross multiply
    21,015.54x = 31,430.30 × 18,691.79
  4. Step 4: Simplify right side
    21,015.54x = 587,488,316.63
  5. Step 5: Solve for x
    x = 587,488,316.63/21,015.54
  6. Step 6: Final answer
    x = 27,954.95

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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.