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Finding the Fourth Proportional to 21,950.28, 30,289.14 and 12,389.28

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Solution

The fourth proportional to 21,950.28, 30,289.14 and 12,389.28 is: 17,095.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,950.28 : 30,289.14 = 12,389.28 : x
  2. Step 2: Convert to fraction form
    21,950.28/30,289.14 = 12,389.28/x
  3. Step 3: Cross multiply
    21,950.28x = 30,289.14 × 12,389.28
  4. Step 4: Simplify right side
    21,950.28x = 375,260,636.42
  5. Step 5: Solve for x
    x = 375,260,636.42/21,950.28
  6. Step 6: Final answer
    x = 17,095.94

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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.