Home / 30,972.88-42,718.79-20,885.34

Finding the Fourth Proportional to 30,972.88, 42,718.79 and 20,885.34

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Solution

The fourth proportional to 30,972.88, 42,718.79 and 20,885.34 is: 28,805.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,972.88 : 42,718.79 = 20,885.34 : x
  2. Step 2: Convert to fraction form
    30,972.88/42,718.79 = 20,885.34/x
  3. Step 3: Cross multiply
    30,972.88x = 42,718.79 × 20,885.34
  4. Step 4: Simplify right side
    30,972.88x = 892,196,665.95
  5. Step 5: Solve for x
    x = 892,196,665.95/30,972.88
  6. Step 6: Final answer
    x = 28,805.74

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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.