Home / 30,761.76-42,458.10-20,145.18

Finding the Fourth Proportional to 30,761.76, 42,458.10 and 20,145.18

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Solution

The fourth proportional to 30,761.76, 42,458.10 and 20,145.18 is: 27,804.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,761.76 : 42,458.10 = 20,145.18 : x
  2. Step 2: Convert to fraction form
    30,761.76/42,458.10 = 20,145.18/x
  3. Step 3: Cross multiply
    30,761.76x = 42,458.10 × 20,145.18
  4. Step 4: Simplify right side
    30,761.76x = 855,326,066.96
  5. Step 5: Solve for x
    x = 855,326,066.96/30,761.76
  6. Step 6: Final answer
    x = 27,804.85

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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.