Home / 30,970.98-42,757.71-20,391.39

Finding the Fourth Proportional to 30,970.98, 42,757.71 and 20,391.39

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Solution

The fourth proportional to 30,970.98, 42,757.71 and 20,391.39 is: 28,151.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.98 : 42,757.71 = 20,391.39 : x
  2. Step 2: Convert to fraction form
    30,970.98/42,757.71 = 20,391.39/x
  3. Step 3: Cross multiply
    30,970.98x = 42,757.71 × 20,391.39
  4. Step 4: Simplify right side
    30,970.98x = 871,889,140.12
  5. Step 5: Solve for x
    x = 871,889,140.12/30,970.98
  6. Step 6: Final answer
    x = 28,151.81

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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.