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Finding the Fourth Proportional to 30,115.78, 45,130.38 and 16,940.32

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Solution

The fourth proportional to 30,115.78, 45,130.38 and 16,940.32 is: 25,386.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,115.78 : 45,130.38 = 16,940.32 : x
  2. Step 2: Convert to fraction form
    30,115.78/45,130.38 = 16,940.32/x
  3. Step 3: Cross multiply
    30,115.78x = 45,130.38 × 16,940.32
  4. Step 4: Simplify right side
    30,115.78x = 764,523,078.92
  5. Step 5: Solve for x
    x = 764,523,078.92/30,115.78
  6. Step 6: Final answer
    x = 25,386.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.