Home / 30,718.14-42,390.25-20,107.54

Finding the Fourth Proportional to 30,718.14, 42,390.25 and 20,107.54

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Solution

The fourth proportional to 30,718.14, 42,390.25 and 20,107.54 is: 27,747.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,718.14 : 42,390.25 = 20,107.54 : x
  2. Step 2: Convert to fraction form
    30,718.14/42,390.25 = 20,107.54/x
  3. Step 3: Cross multiply
    30,718.14x = 42,390.25 × 20,107.54
  4. Step 4: Simplify right side
    30,718.14x = 852,363,647.49
  5. Step 5: Solve for x
    x = 852,363,647.49/30,718.14
  6. Step 6: Final answer
    x = 27,747.89

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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.