Home / 21,435.81-29,581.36-11,875.72

Finding the Fourth Proportional to 21,435.81, 29,581.36 and 11,875.72

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Solution

The fourth proportional to 21,435.81, 29,581.36 and 11,875.72 is: 16,388.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,435.81 : 29,581.36 = 11,875.72 : x
  2. Step 2: Convert to fraction form
    21,435.81/29,581.36 = 11,875.72/x
  3. Step 3: Cross multiply
    21,435.81x = 29,581.36 × 11,875.72
  4. Step 4: Simplify right side
    21,435.81x = 351,299,948.58
  5. Step 5: Solve for x
    x = 351,299,948.58/21,435.81
  6. Step 6: Final answer
    x = 16,388.46

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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.