Home / 30,985.12-42,766.23-20,375.74

Finding the Fourth Proportional to 30,985.12, 42,766.23 and 20,375.74

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Solution

The fourth proportional to 30,985.12, 42,766.23 and 20,375.74 is: 28,122.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,985.12 : 42,766.23 = 20,375.74 : x
  2. Step 2: Convert to fraction form
    30,985.12/42,766.23 = 20,375.74/x
  3. Step 3: Cross multiply
    30,985.12x = 42,766.23 × 20,375.74
  4. Step 4: Simplify right side
    30,985.12x = 871,393,583.26
  5. Step 5: Solve for x
    x = 871,393,583.26/30,985.12
  6. Step 6: Final answer
    x = 28,122.97

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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.