Home / 21,215.52-31,774.05-20,477.43

Finding the Fourth Proportional to 21,215.52, 31,774.05 and 20,477.43

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Solution

The fourth proportional to 21,215.52, 31,774.05 and 20,477.43 is: 30,668.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.52 : 31,774.05 = 20,477.43 : x
  2. Step 2: Convert to fraction form
    21,215.52/31,774.05 = 20,477.43/x
  3. Step 3: Cross multiply
    21,215.52x = 31,774.05 × 20,477.43
  4. Step 4: Simplify right side
    21,215.52x = 650,650,884.69
  5. Step 5: Solve for x
    x = 650,650,884.69/21,215.52
  6. Step 6: Final answer
    x = 30,668.63

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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.