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Finding the Fourth Proportional to 21,978.05, 30,329.07 and 12,903.26

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Solution

The fourth proportional to 21,978.05, 30,329.07 and 12,903.26 is: 17,806.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.05 : 30,329.07 = 12,903.26 : x
  2. Step 2: Convert to fraction form
    21,978.05/30,329.07 = 12,903.26/x
  3. Step 3: Cross multiply
    21,978.05x = 30,329.07 × 12,903.26
  4. Step 4: Simplify right side
    21,978.05x = 391,343,724.12
  5. Step 5: Solve for x
    x = 391,343,724.12/21,978.05
  6. Step 6: Final answer
    x = 17,806.12

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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.