Home / 21,278.28-29,351.12-13,313.96

Finding the Fourth Proportional to 21,278.28, 29,351.12 and 13,313.96

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Solution

The fourth proportional to 21,278.28, 29,351.12 and 13,313.96 is: 18,365.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.28 : 29,351.12 = 13,313.96 : x
  2. Step 2: Convert to fraction form
    21,278.28/29,351.12 = 13,313.96/x
  3. Step 3: Cross multiply
    21,278.28x = 29,351.12 × 13,313.96
  4. Step 4: Simplify right side
    21,278.28x = 390,779,637.64
  5. Step 5: Solve for x
    x = 390,779,637.64/21,278.28
  6. Step 6: Final answer
    x = 18,365.19

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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.