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Finding the Fourth Proportional to 12,984.75, 19,485.78 and 4,776.75

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Solution

The fourth proportional to 12,984.75, 19,485.78 and 4,776.75 is: 7,168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,984.75 : 19,485.78 = 4,776.75 : x
  2. Step 2: Convert to fraction form
    12,984.75/19,485.78 = 4,776.75/x
  3. Step 3: Cross multiply
    12,984.75x = 19,485.78 × 4,776.75
  4. Step 4: Simplify right side
    12,984.75x = 93,078,699.62
  5. Step 5: Solve for x
    x = 93,078,699.62/12,984.75
  6. Step 6: Final answer
    x = 7,168.31

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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.