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Finding the Fourth Proportional to 30,976.69, 42,751.47 and 18,401.44

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Solution

The fourth proportional to 30,976.69, 42,751.47 and 18,401.44 is: 25,396.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,976.69 : 42,751.47 = 18,401.44 : x
  2. Step 2: Convert to fraction form
    30,976.69/42,751.47 = 18,401.44/x
  3. Step 3: Cross multiply
    30,976.69x = 42,751.47 × 18,401.44
  4. Step 4: Simplify right side
    30,976.69x = 786,688,610.12
  5. Step 5: Solve for x
    x = 786,688,610.12/30,976.69
  6. Step 6: Final answer
    x = 25,396.15

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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.