Home / 30,985.20-42,766.45-20,375.82

Finding the Fourth Proportional to 30,985.20, 42,766.45 and 20,375.82

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Solution

The fourth proportional to 30,985.20, 42,766.45 and 20,375.82 is: 28,123.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,985.20 : 42,766.45 = 20,375.82 : x
  2. Step 2: Convert to fraction form
    30,985.20/42,766.45 = 20,375.82/x
  3. Step 3: Cross multiply
    30,985.20x = 42,766.45 × 20,375.82
  4. Step 4: Simplify right side
    30,985.20x = 871,401,436.30
  5. Step 5: Solve for x
    x = 871,401,436.30/30,985.20
  6. Step 6: Final answer
    x = 28,123.15

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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.