Home / 21,110.40-29,132.64-13,155.84

Finding the Fourth Proportional to 21,110.40, 29,132.64 and 13,155.84

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Solution

The fourth proportional to 21,110.40, 29,132.64 and 13,155.84 is: 18,155.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,110.40 : 29,132.64 = 13,155.84 : x
  2. Step 2: Convert to fraction form
    21,110.40/29,132.64 = 13,155.84/x
  3. Step 3: Cross multiply
    21,110.40x = 29,132.64 × 13,155.84
  4. Step 4: Simplify right side
    21,110.40x = 383,264,350.62
  5. Step 5: Solve for x
    x = 383,264,350.62/21,110.40
  6. Step 6: Final answer
    x = 18,155.24

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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.