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Finding the Fourth Proportional to 20,978.34, 28,949.04 and 11,545.08

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Solution

The fourth proportional to 20,978.34, 28,949.04 and 11,545.08 is: 15,931.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.34 : 28,949.04 = 11,545.08 : x
  2. Step 2: Convert to fraction form
    20,978.34/28,949.04 = 11,545.08/x
  3. Step 3: Cross multiply
    20,978.34x = 28,949.04 × 11,545.08
  4. Step 4: Simplify right side
    20,978.34x = 334,218,982.72
  5. Step 5: Solve for x
    x = 334,218,982.72/20,978.34
  6. Step 6: Final answer
    x = 15,931.62

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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.