Home / 30,970.11-42,756.49-20,390.50

Finding the Fourth Proportional to 30,970.11, 42,756.49 and 20,390.50

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Solution

The fourth proportional to 30,970.11, 42,756.49 and 20,390.50 is: 28,150.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.11 : 42,756.49 = 20,390.50 : x
  2. Step 2: Convert to fraction form
    30,970.11/42,756.49 = 20,390.50/x
  3. Step 3: Cross multiply
    30,970.11x = 42,756.49 × 20,390.50
  4. Step 4: Simplify right side
    30,970.11x = 871,826,209.35
  5. Step 5: Solve for x
    x = 871,826,209.35/30,970.11
  6. Step 6: Final answer
    x = 28,150.57

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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.