Home / 30,979.45-42,758.48-20,370.07

Finding the Fourth Proportional to 30,979.45, 42,758.48 and 20,370.07

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Solution

The fourth proportional to 30,979.45, 42,758.48 and 20,370.07 is: 28,115.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,979.45 : 42,758.48 = 20,370.07 : x
  2. Step 2: Convert to fraction form
    30,979.45/42,758.48 = 20,370.07/x
  3. Step 3: Cross multiply
    30,979.45x = 42,758.48 × 20,370.07
  4. Step 4: Simplify right side
    30,979.45x = 870,993,230.69
  5. Step 5: Solve for x
    x = 870,993,230.69/30,979.45
  6. Step 6: Final answer
    x = 28,115.19

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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.