Home / 21,115.89-29,140.29-11,556.61

Finding the Fourth Proportional to 21,115.89, 29,140.29 and 11,556.61

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Solution

The fourth proportional to 21,115.89, 29,140.29 and 11,556.61 is: 15,948.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.89 : 29,140.29 = 11,556.61 : x
  2. Step 2: Convert to fraction form
    21,115.89/29,140.29 = 11,556.61/x
  3. Step 3: Cross multiply
    21,115.89x = 29,140.29 × 11,556.61
  4. Step 4: Simplify right side
    21,115.89x = 336,762,966.82
  5. Step 5: Solve for x
    x = 336,762,966.82/21,115.89
  6. Step 6: Final answer
    x = 15,948.32

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.