Home / 30,890.88-42,652.80-18,970.56

Finding the Fourth Proportional to 30,890.88, 42,652.80 and 18,970.56

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Solution

The fourth proportional to 30,890.88, 42,652.80 and 18,970.56 is: 26,193.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,890.88 : 42,652.80 = 18,970.56 : x
  2. Step 2: Convert to fraction form
    30,890.88/42,652.80 = 18,970.56/x
  3. Step 3: Cross multiply
    30,890.88x = 42,652.80 × 18,970.56
  4. Step 4: Simplify right side
    30,890.88x = 809,147,501.57
  5. Step 5: Solve for x
    x = 809,147,501.57/30,890.88
  6. Step 6: Final answer
    x = 26,193.73

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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.