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Finding the Fourth Proportional to 15,929.40, 21,982.50 and 8,855.40

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Solution

The fourth proportional to 15,929.40, 21,982.50 and 8,855.40 is: 12,220.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,929.40 : 21,982.50 = 8,855.40 : x
  2. Step 2: Convert to fraction form
    15,929.40/21,982.50 = 8,855.40/x
  3. Step 3: Cross multiply
    15,929.40x = 21,982.50 × 8,855.40
  4. Step 4: Simplify right side
    15,929.40x = 194,663,830.50
  5. Step 5: Solve for x
    x = 194,663,830.50/15,929.40
  6. Step 6: Final answer
    x = 12,220.41

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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.