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Finding the Fourth Proportional to 39,381, 59,088.90 and 20,656.56

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Solution

The fourth proportional to 39,381, 59,088.90 and 20,656.56 is: 30,993.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,381 : 59,088.90 = 20,656.56 : x
  2. Step 2: Convert to fraction form
    39,381/59,088.90 = 20,656.56/x
  3. Step 3: Cross multiply
    39,381x = 59,088.90 × 20,656.56
  4. Step 4: Simplify right side
    39,381x = 1,220,573,408.18
  5. Step 5: Solve for x
    x = 1,220,573,408.18/39,381
  6. Step 6: Final answer
    x = 30,993.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.