Home / 30,960.73-42,743.51-20,381.12

Finding the Fourth Proportional to 30,960.73, 42,743.51 and 20,381.12

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Solution

The fourth proportional to 30,960.73, 42,743.51 and 20,381.12 is: 28,137.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,960.73 : 42,743.51 = 20,381.12 : x
  2. Step 2: Convert to fraction form
    30,960.73/42,743.51 = 20,381.12/x
  3. Step 3: Cross multiply
    30,960.73x = 42,743.51 × 20,381.12
  4. Step 4: Simplify right side
    30,960.73x = 871,160,443.77
  5. Step 5: Solve for x
    x = 871,160,443.77/30,960.73
  6. Step 6: Final answer
    x = 28,137.60

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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.