Home / 30,969.18-42,755.20-20,389.57

Finding the Fourth Proportional to 30,969.18, 42,755.20 and 20,389.57

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Solution

The fourth proportional to 30,969.18, 42,755.20 and 20,389.57 is: 28,149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,969.18 : 42,755.20 = 20,389.57 : x
  2. Step 2: Convert to fraction form
    30,969.18/42,755.20 = 20,389.57/x
  3. Step 3: Cross multiply
    30,969.18x = 42,755.20 × 20,389.57
  4. Step 4: Simplify right side
    30,969.18x = 871,759,827.54
  5. Step 5: Solve for x
    x = 871,759,827.54/30,969.18
  6. Step 6: Final answer
    x = 28,149.28

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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.