Home / 21,534.34-29,712.09-13,147.78

Finding the Fourth Proportional to 21,534.34, 29,712.09 and 13,147.78

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Solution

The fourth proportional to 21,534.34, 29,712.09 and 13,147.78 is: 18,140.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,534.34 : 29,712.09 = 13,147.78 : x
  2. Step 2: Convert to fraction form
    21,534.34/29,712.09 = 13,147.78/x
  3. Step 3: Cross multiply
    21,534.34x = 29,712.09 × 13,147.78
  4. Step 4: Simplify right side
    21,534.34x = 390,648,022.66
  5. Step 5: Solve for x
    x = 390,648,022.66/21,534.34
  6. Step 6: Final answer
    x = 18,140.70

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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.