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Finding the Fourth Proportional to 20,899.81, 28,879.11 and 15,543.88

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Solution

The fourth proportional to 20,899.81, 28,879.11 and 15,543.88 is: 21,478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,899.81 : 28,879.11 = 15,543.88 : x
  2. Step 2: Convert to fraction form
    20,899.81/28,879.11 = 15,543.88/x
  3. Step 3: Cross multiply
    20,899.81x = 28,879.11 × 15,543.88
  4. Step 4: Simplify right side
    20,899.81x = 448,893,420.35
  5. Step 5: Solve for x
    x = 448,893,420.35/20,899.81
  6. Step 6: Final answer
    x = 21,478.35

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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.