Home / 21,218.36-31,829.15-6,428.50

Finding the Fourth Proportional to 21,218.36, 31,829.15 and 6,428.50

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Solution

The fourth proportional to 21,218.36, 31,829.15 and 6,428.50 is: 9,643.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.36 : 31,829.15 = 6,428.50 : x
  2. Step 2: Convert to fraction form
    21,218.36/31,829.15 = 6,428.50/x
  3. Step 3: Cross multiply
    21,218.36x = 31,829.15 × 6,428.50
  4. Step 4: Simplify right side
    21,218.36x = 204,613,627.27
  5. Step 5: Solve for x
    x = 204,613,627.27/21,218.36
  6. Step 6: Final answer
    x = 9,643.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.