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Finding the Fourth Proportional to 30,893.40, 42,622.20 and 18,322.20

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Solution

The fourth proportional to 30,893.40, 42,622.20 and 18,322.20 is: 25,278.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,893.40 : 42,622.20 = 18,322.20 : x
  2. Step 2: Convert to fraction form
    30,893.40/42,622.20 = 18,322.20/x
  3. Step 3: Cross multiply
    30,893.40x = 42,622.20 × 18,322.20
  4. Step 4: Simplify right side
    30,893.40x = 780,932,472.84
  5. Step 5: Solve for x
    x = 780,932,472.84/30,893.40
  6. Step 6: Final answer
    x = 25,278.29

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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.