Home / 21,220.84-31,829.10-5,639.68

Finding the Fourth Proportional to 21,220.84, 31,829.10 and 5,639.68

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Solution

The fourth proportional to 21,220.84, 31,829.10 and 5,639.68 is: 8,458.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.84 : 31,829.10 = 5,639.68 : x
  2. Step 2: Convert to fraction form
    21,220.84/31,829.10 = 5,639.68/x
  3. Step 3: Cross multiply
    21,220.84x = 31,829.10 × 5,639.68
  4. Step 4: Simplify right side
    21,220.84x = 179,505,938.69
  5. Step 5: Solve for x
    x = 179,505,938.69/21,220.84
  6. Step 6: Final answer
    x = 8,458.95

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1.5x scale

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.