Home / 30,984.12-42,764.85-20,374.74

Finding the Fourth Proportional to 30,984.12, 42,764.85 and 20,374.74

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Solution

The fourth proportional to 30,984.12, 42,764.85 and 20,374.74 is: 28,121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,984.12 : 42,764.85 = 20,374.74 : x
  2. Step 2: Convert to fraction form
    30,984.12/42,764.85 = 20,374.74/x
  3. Step 3: Cross multiply
    30,984.12x = 42,764.85 × 20,374.74
  4. Step 4: Simplify right side
    30,984.12x = 871,322,699.89
  5. Step 5: Solve for x
    x = 871,322,699.89/30,984.12
  6. Step 6: Final answer
    x = 28,121.59

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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.