Home / 30,970.81-42,752.79-20,912.86

Finding the Fourth Proportional to 30,970.81, 42,752.79 and 20,912.86

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Solution

The fourth proportional to 30,970.81, 42,752.79 and 20,912.86 is: 28,868.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.81 : 42,752.79 = 20,912.86 : x
  2. Step 2: Convert to fraction form
    30,970.81/42,752.79 = 20,912.86/x
  3. Step 3: Cross multiply
    30,970.81x = 42,752.79 × 20,912.86
  4. Step 4: Simplify right side
    30,970.81x = 894,083,111.88
  5. Step 5: Solve for x
    x = 894,083,111.88/30,970.81
  6. Step 6: Final answer
    x = 28,868.57

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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.