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Finding the Fourth Proportional to 15,421, 21,280.98 and 8,797

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Solution

The fourth proportional to 15,421, 21,280.98 and 8,797 is: 12,139.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,421 : 21,280.98 = 8,797 : x
  2. Step 2: Convert to fraction form
    15,421/21,280.98 = 8,797/x
  3. Step 3: Cross multiply
    15,421x = 21,280.98 × 8,797
  4. Step 4: Simplify right side
    15,421x = 187,208,781.06
  5. Step 5: Solve for x
    x = 187,208,781.06/15,421
  6. Step 6: Final answer
    x = 12,139.86

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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.