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Finding the Fourth Proportional to 12,879.28, 17,783.44 and 9,890.40

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Solution

The fourth proportional to 12,879.28, 17,783.44 and 9,890.40 is: 13,656.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.28 : 17,783.44 = 9,890.40 : x
  2. Step 2: Convert to fraction form
    12,879.28/17,783.44 = 9,890.40/x
  3. Step 3: Cross multiply
    12,879.28x = 17,783.44 × 9,890.40
  4. Step 4: Simplify right side
    12,879.28x = 175,885,334.98
  5. Step 5: Solve for x
    x = 175,885,334.98/12,879.28
  6. Step 6: Final answer
    x = 13,656.46

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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.