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Finding the Fourth Proportional to 12,478.32, 17,220.09 and 6,889.32

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Solution

The fourth proportional to 12,478.32, 17,220.09 and 6,889.32 is: 9,507.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.32 : 17,220.09 = 6,889.32 : x
  2. Step 2: Convert to fraction form
    12,478.32/17,220.09 = 6,889.32/x
  3. Step 3: Cross multiply
    12,478.32x = 17,220.09 × 6,889.32
  4. Step 4: Simplify right side
    12,478.32x = 118,634,710.44
  5. Step 5: Solve for x
    x = 118,634,710.44/12,478.32
  6. Step 6: Final answer
    x = 9,507.27

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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.