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Finding the Fourth Proportional to 15,929.69, 21,980.39 and 8,855.93

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Solution

The fourth proportional to 15,929.69, 21,980.39 and 8,855.93 is: 12,219.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,929.69 : 21,980.39 = 8,855.93 : x
  2. Step 2: Convert to fraction form
    15,929.69/21,980.39 = 8,855.93/x
  3. Step 3: Cross multiply
    15,929.69x = 21,980.39 × 8,855.93
  4. Step 4: Simplify right side
    15,929.69x = 194,656,750.93
  5. Step 5: Solve for x
    x = 194,656,750.93/15,929.69
  6. Step 6: Final answer
    x = 12,219.75

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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.