Home / 30,958.80-42,724-18,212.90

Finding the Fourth Proportional to 30,958.80, 42,724 and 18,212.90

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Solution

The fourth proportional to 30,958.80, 42,724 and 18,212.90 is: 25,134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,958.80 : 42,724 = 18,212.90 : x
  2. Step 2: Convert to fraction form
    30,958.80/42,724 = 18,212.90/x
  3. Step 3: Cross multiply
    30,958.80x = 42,724 × 18,212.90
  4. Step 4: Simplify right side
    30,958.80x = 778,127,939.60
  5. Step 5: Solve for x
    x = 778,127,939.60/30,958.80
  6. Step 6: Final answer
    x = 25,134.31

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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.