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Finding the Fourth Proportional to 20,402.88, 30,434.80 and 20,064.56

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Solution

The fourth proportional to 20,402.88, 30,434.80 and 20,064.56 is: 29,930.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,402.88 : 30,434.80 = 20,064.56 : x
  2. Step 2: Convert to fraction form
    20,402.88/30,434.80 = 20,064.56/x
  3. Step 3: Cross multiply
    20,402.88x = 30,434.80 × 20,064.56
  4. Step 4: Simplify right side
    20,402.88x = 610,660,870.69
  5. Step 5: Solve for x
    x = 610,660,870.69/20,402.88
  6. Step 6: Final answer
    x = 29,930.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.