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Finding the Fourth Proportional to 21,711.65, 29,942.02 and 14,154.21

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Solution

The fourth proportional to 21,711.65, 29,942.02 and 14,154.21 is: 19,519.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,711.65 : 29,942.02 = 14,154.21 : x
  2. Step 2: Convert to fraction form
    21,711.65/29,942.02 = 14,154.21/x
  3. Step 3: Cross multiply
    21,711.65x = 29,942.02 × 14,154.21
  4. Step 4: Simplify right side
    21,711.65x = 423,805,656.60
  5. Step 5: Solve for x
    x = 423,805,656.60/21,711.65
  6. Step 6: Final answer
    x = 19,519.74

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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.