Home / 30,970.55-42,752.44-20,912.61

Finding the Fourth Proportional to 30,970.55, 42,752.44 and 20,912.61

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Solution

The fourth proportional to 30,970.55, 42,752.44 and 20,912.61 is: 28,868.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.55 : 42,752.44 = 20,912.61 : x
  2. Step 2: Convert to fraction form
    30,970.55/42,752.44 = 20,912.61/x
  3. Step 3: Cross multiply
    30,970.55x = 42,752.44 × 20,912.61
  4. Step 4: Simplify right side
    30,970.55x = 894,065,290.73
  5. Step 5: Solve for x
    x = 894,065,290.73/30,970.55
  6. Step 6: Final answer
    x = 28,868.24

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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.