Home / 30,753.12-42,424.56-20,138.08

Finding the Fourth Proportional to 30,753.12, 42,424.56 and 20,138.08

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Solution

The fourth proportional to 30,753.12, 42,424.56 and 20,138.08 is: 27,780.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,753.12 : 42,424.56 = 20,138.08 : x
  2. Step 2: Convert to fraction form
    30,753.12/42,424.56 = 20,138.08/x
  3. Step 3: Cross multiply
    30,753.12x = 42,424.56 × 20,138.08
  4. Step 4: Simplify right side
    30,753.12x = 854,349,183.24
  5. Step 5: Solve for x
    x = 854,349,183.24/30,753.12
  6. Step 6: Final answer
    x = 27,780.89

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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.