Home / 30,965.60-42,750.24-20,385.99

Finding the Fourth Proportional to 30,965.60, 42,750.24 and 20,385.99

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Solution

The fourth proportional to 30,965.60, 42,750.24 and 20,385.99 is: 28,144.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,965.60 : 42,750.24 = 20,385.99 : x
  2. Step 2: Convert to fraction form
    30,965.60/42,750.24 = 20,385.99/x
  3. Step 3: Cross multiply
    30,965.60x = 42,750.24 × 20,385.99
  4. Step 4: Simplify right side
    30,965.60x = 871,505,888.69
  5. Step 5: Solve for x
    x = 871,505,888.69/30,965.60
  6. Step 6: Final answer
    x = 28,144.32

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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.