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Finding the Fourth Proportional to 6,643.78, 9,166.22 and 4,287.49

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Solution

The fourth proportional to 6,643.78, 9,166.22 and 4,287.49 is: 5,915.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,643.78 : 9,166.22 = 4,287.49 : x
  2. Step 2: Convert to fraction form
    6,643.78/9,166.22 = 4,287.49/x
  3. Step 3: Cross multiply
    6,643.78x = 9,166.22 × 4,287.49
  4. Step 4: Simplify right side
    6,643.78x = 39,300,076.59
  5. Step 5: Solve for x
    x = 39,300,076.59/6,643.78
  6. Step 6: Final answer
    x = 5,915.32

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Double scale
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Similar ratio
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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.