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Finding the Fourth Proportional to 20,703.96, 28,508.19 and 15,606.90

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Solution

The fourth proportional to 20,703.96, 28,508.19 and 15,606.90 is: 21,489.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,703.96 : 28,508.19 = 15,606.90 : x
  2. Step 2: Convert to fraction form
    20,703.96/28,508.19 = 15,606.90/x
  3. Step 3: Cross multiply
    20,703.96x = 28,508.19 × 15,606.90
  4. Step 4: Simplify right side
    20,703.96x = 444,924,470.51
  5. Step 5: Solve for x
    x = 444,924,470.51/20,703.96
  6. Step 6: Final answer
    x = 21,489.82

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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.