Home / 20,419.36-28,174.40-13,356.16

Finding the Fourth Proportional to 20,419.36, 28,174.40 and 13,356.16

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Solution

The fourth proportional to 20,419.36, 28,174.40 and 13,356.16 is: 18,428.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.36 : 28,174.40 = 13,356.16 : x
  2. Step 2: Convert to fraction form
    20,419.36/28,174.40 = 13,356.16/x
  3. Step 3: Cross multiply
    20,419.36x = 28,174.40 × 13,356.16
  4. Step 4: Simplify right side
    20,419.36x = 376,301,794.30
  5. Step 5: Solve for x
    x = 376,301,794.30/20,419.36
  6. Step 6: Final answer
    x = 18,428.68

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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.