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Finding the Fourth Proportional to 12,378.40, 17,059.86 and 9,015.88

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Solution

The fourth proportional to 12,378.40, 17,059.86 and 9,015.88 is: 12,425.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,378.40 : 17,059.86 = 9,015.88 : x
  2. Step 2: Convert to fraction form
    12,378.40/17,059.86 = 9,015.88/x
  3. Step 3: Cross multiply
    12,378.40x = 17,059.86 × 9,015.88
  4. Step 4: Simplify right side
    12,378.40x = 153,809,650.58
  5. Step 5: Solve for x
    x = 153,809,650.58/12,378.40
  6. Step 6: Final answer
    x = 12,425.65

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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.