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Finding the Fourth Proportional to 12,936.40, 17,851.72 and 7,909.08

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Solution

The fourth proportional to 12,936.40, 17,851.72 and 7,909.08 is: 10,914.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,936.40 : 17,851.72 = 7,909.08 : x
  2. Step 2: Convert to fraction form
    12,936.40/17,851.72 = 7,909.08/x
  3. Step 3: Cross multiply
    12,936.40x = 17,851.72 × 7,909.08
  4. Step 4: Simplify right side
    12,936.40x = 141,190,681.62
  5. Step 5: Solve for x
    x = 141,190,681.62/12,936.40
  6. Step 6: Final answer
    x = 10,914.22

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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.