Home / 30,755.12-42,427.32-20,140.08

Finding the Fourth Proportional to 30,755.12, 42,427.32 and 20,140.08

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Solution

The fourth proportional to 30,755.12, 42,427.32 and 20,140.08 is: 27,783.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,755.12 : 42,427.32 = 20,140.08 : x
  2. Step 2: Convert to fraction form
    30,755.12/42,427.32 = 20,140.08/x
  3. Step 3: Cross multiply
    30,755.12x = 42,427.32 × 20,140.08
  4. Step 4: Simplify right side
    30,755.12x = 854,489,618.99
  5. Step 5: Solve for x
    x = 854,489,618.99/30,755.12
  6. Step 6: Final answer
    x = 27,783.65

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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.