Home / 30,920.32-42,625.12-20,291.36

Finding the Fourth Proportional to 30,920.32, 42,625.12 and 20,291.36

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Solution

The fourth proportional to 30,920.32, 42,625.12 and 20,291.36 is: 27,972.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,920.32 : 42,625.12 = 20,291.36 : x
  2. Step 2: Convert to fraction form
    30,920.32/42,625.12 = 20,291.36/x
  3. Step 3: Cross multiply
    30,920.32x = 42,625.12 × 20,291.36
  4. Step 4: Simplify right side
    30,920.32x = 864,921,654.96
  5. Step 5: Solve for x
    x = 864,921,654.96/30,920.32
  6. Step 6: Final answer
    x = 27,972.60

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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.