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Finding the Fourth Proportional to 28,167.71, 38,872.05 and 15,421.43

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Solution

The fourth proportional to 28,167.71, 38,872.05 and 15,421.43 is: 21,281.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,167.71 : 38,872.05 = 15,421.43 : x
  2. Step 2: Convert to fraction form
    28,167.71/38,872.05 = 15,421.43/x
  3. Step 3: Cross multiply
    28,167.71x = 38,872.05 × 15,421.43
  4. Step 4: Simplify right side
    28,167.71x = 599,462,353.22
  5. Step 5: Solve for x
    x = 599,462,353.22/28,167.71
  6. Step 6: Final answer
    x = 21,281.90

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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.