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Finding the Fourth Proportional to 20,978.92, 28,959.98 and 15,000.20

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Solution

The fourth proportional to 20,978.92, 28,959.98 and 15,000.20 is: 20,706.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.92 : 28,959.98 = 15,000.20 : x
  2. Step 2: Convert to fraction form
    20,978.92/28,959.98 = 15,000.20/x
  3. Step 3: Cross multiply
    20,978.92x = 28,959.98 × 15,000.20
  4. Step 4: Simplify right side
    20,978.92x = 434,405,492.00
  5. Step 5: Solve for x
    x = 434,405,492.00/20,978.92
  6. Step 6: Final answer
    x = 20,706.76

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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.