Home / 30,780.82-42,460.89-20,589.46

Finding the Fourth Proportional to 30,780.82, 42,460.89 and 20,589.46

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Solution

The fourth proportional to 30,780.82, 42,460.89 and 20,589.46 is: 28,402.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,780.82 : 42,460.89 = 20,589.46 : x
  2. Step 2: Convert to fraction form
    30,780.82/42,460.89 = 20,589.46/x
  3. Step 3: Cross multiply
    30,780.82x = 42,460.89 × 20,589.46
  4. Step 4: Simplify right side
    30,780.82x = 874,246,796.22
  5. Step 5: Solve for x
    x = 874,246,796.22/30,780.82
  6. Step 6: Final answer
    x = 28,402.32

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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.