Home / 30,965.31-42,749.85-20,385.71

Finding the Fourth Proportional to 30,965.31, 42,749.85 and 20,385.71

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Solution

The fourth proportional to 30,965.31, 42,749.85 and 20,385.71 is: 28,143.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,965.31 : 42,749.85 = 20,385.71 : x
  2. Step 2: Convert to fraction form
    30,965.31/42,749.85 = 20,385.71/x
  3. Step 3: Cross multiply
    30,965.31x = 42,749.85 × 20,385.71
  4. Step 4: Simplify right side
    30,965.31x = 871,485,830.89
  5. Step 5: Solve for x
    x = 871,485,830.89/30,965.31
  6. Step 6: Final answer
    x = 28,143.94

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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.