Home / 21,638.72-29,861.66-12,686.47

Finding the Fourth Proportional to 21,638.72, 29,861.66 and 12,686.47

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Solution

The fourth proportional to 21,638.72, 29,861.66 and 12,686.47 is: 17,507.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,638.72 : 29,861.66 = 12,686.47 : x
  2. Step 2: Convert to fraction form
    21,638.72/29,861.66 = 12,686.47/x
  3. Step 3: Cross multiply
    21,638.72x = 29,861.66 × 12,686.47
  4. Step 4: Simplify right side
    21,638.72x = 378,839,053.74
  5. Step 5: Solve for x
    x = 378,839,053.74/21,638.72
  6. Step 6: Final answer
    x = 17,507.46

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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.