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Finding the Fourth Proportional to 12,643.59, 17,448.13 and 6,978.69

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Solution

The fourth proportional to 12,643.59, 17,448.13 and 6,978.69 is: 9,630.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643.59 : 17,448.13 = 6,978.69 : x
  2. Step 2: Convert to fraction form
    12,643.59/17,448.13 = 6,978.69/x
  3. Step 3: Cross multiply
    12,643.59x = 17,448.13 × 6,978.69
  4. Step 4: Simplify right side
    12,643.59x = 121,765,090.35
  5. Step 5: Solve for x
    x = 121,765,090.35/12,643.59
  6. Step 6: Final answer
    x = 9,630.58

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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.