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Finding the Fourth Proportional to 21,390.68, 29,519.40 and 11,959.40

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Solution

The fourth proportional to 21,390.68, 29,519.40 and 11,959.40 is: 16,504.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.68 : 29,519.40 = 11,959.40 : x
  2. Step 2: Convert to fraction form
    21,390.68/29,519.40 = 11,959.40/x
  3. Step 3: Cross multiply
    21,390.68x = 29,519.40 × 11,959.40
  4. Step 4: Simplify right side
    21,390.68x = 353,034,312.36
  5. Step 5: Solve for x
    x = 353,034,312.36/21,390.68
  6. Step 6: Final answer
    x = 16,504.12

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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.