Home / 21,115.72-31,746.48-20,561.68

Finding the Fourth Proportional to 21,115.72, 31,746.48 and 20,561.68

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Solution

The fourth proportional to 21,115.72, 31,746.48 and 20,561.68 is: 30,913.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.72 : 31,746.48 = 20,561.68 : x
  2. Step 2: Convert to fraction form
    21,115.72/31,746.48 = 20,561.68/x
  3. Step 3: Cross multiply
    21,115.72x = 31,746.48 × 20,561.68
  4. Step 4: Simplify right side
    21,115.72x = 652,760,962.89
  5. Step 5: Solve for x
    x = 652,760,962.89/21,115.72
  6. Step 6: Final answer
    x = 30,913.51

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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.